题目内容

(1)438+203(2)256+199(3)416-302(4)325-198
(5)278+498(6)3.6+2.7+6.4+7.3(7)数学公式+数学公式+数学公式+数学公式(8)1.3+4.25+3.7+3
(9)1874-324-476(10)5-1.4-1.6(11)30-8.12-4.13-7.75(12)数学公式-数学公式+数学公式
(13)4.3-2.45+5.7-6.55(14)125×48(15)25×32(16)35×1.4
(17)1.25×88(18)0.25×444(19)32×0.25×12.5(20)25×80×0.04×125
(21)1.9×4×0.5(22)25×1.25×4×0.8(23)(1.6+1.6+1.6+1.6)×2.5(24)(0.7+0.7…+0.7)×12.5(80个0.7相加)
(24)9.9×8.6+8.6(25)99×5.4
(26)4.8×1.01(27)95×101-95(28)95×102-190(29)95.6×18+0.4×18
(30)(数学公式-数学公式+数学公式)×12(31)(数学公式+数学公式-数学公式)÷数学公式(32)24×(数学公式+数学公式-数学公式(33)24÷(数学公式+数学公式-数学公式
(34)1.25×3.6+1.25×数学公式+数学公式(35)3.3×数学公式+0.75×数学公式+75%(36)数学公式×6.6+7.5×数学公式(37)9.56×180-95.6×8
(38)4.8×37+47×6.3(39)9.5×8.8+0.12×95(40)数学公式×21(41)数学公式×33
(42)数学公式÷数学公式(43)数学公式÷数学公式(44)数学公式÷42(45)6×0.75+5×数学公式-3÷4
(46)5.4÷1.2÷5(47)270÷18(48)120÷(1.2×4)(49)73÷0.8÷12.5
(50)16÷2.5(51)48÷1.25(52)数学公式-(数学公式-数学公式)+数学公式(53)84-(54-16)
(54)84-(54+16)(55)9999×7778+3333×6666(56)3.6×31.4+43.9×6.4(57)(数学公式+数学公式)×数学公式
(58)数学公式×数学公式+数学公式÷数学公式(59)数学公式-数学公式-数学公式(60)数学公式×数学公式-数学公式×数学公式(61)数学公式×数学公式÷数学公式×数学公式
(62)数学公式-数学公式×数学公式-数学公式(63)数学公式×[数学公式÷(数学公式+数学公式)](64)(0.9+5)×3+2.3(65)56×数学公式
(66)数学公式+数学公式÷数学公式+数学公式(67)(数学公式+数学公式)÷(数学公式+数学公式(68)数学公式÷(数学公式-数学公式(69)(数学公式-数学公式)÷数学公式
(70)7.2÷(5-0.75-0.25)(71)6.4+3.6÷0.5+4.5(72)(6.4+3.6)÷0.5+4.5(73)495÷55+495÷45
(74)8÷0.4+8÷1.6(75)0.9+99×0.9(76)5.28-(1.62+2.28)(77)数学公式-数学公式+数学公式
(78)4×(数学公式+)(79)数学公式+数学公式++(80)2-(数学公式+数学公式)-数学公式(81)数学公式×数学公式+数学公式×数学公式
(82)数学公式×数学公式+数学公式×数学公式(83)数学公式×9+数学公式(84)(5+数学公式)×数学公式(85)(数学公式+数学公式)×24
(86)(20+数学公式)×数学公式(87)数学公式×39×数学公式(88)数学公式×(数学公式+数学公式(89)(数学公式-数学公式)×12
(90)数学公式×(26×数学公式(91)数学公式+数学公式+数学公式+数学公式(92)17×数学公式-数学公式(93)(数学公式+数学公式)×数学公式
(94)(数学公式+数学公式)÷数学公式(95)(数学公式+数学公式)÷3(96)(数学公式-数学公式)÷数学公式(97)数学公式÷数学公式+数学公式÷数学公式
(98)数学公式×(10+数学公式(99)(21+数学公式)÷数学公式(100)数学公式×数学公式数学公式(101)数学公式÷数学公式+数学公式÷数学公式
(102)(数学公式-数学公式)÷数学公式(103)数学公式×数学公式+数学公式+(104)数学公式_数学公式×数学公式-数学公式(105)数学公式-(数学公式÷数学公式+数学公式
(106)数学公式+数学公式×数学公式+数学公式(107)1-数学公式÷数学公式-数学公式(108)数学公式×数学公式+÷4(109)5-(4+数学公式
(110)1125-997(111)7.46-0.83-2.17(112)12.85-1.17-8.83+1.15(113)4.5×102
(114)0.4×6.3×25(115)(4.9+4.9+…+4.9)×2.5(16个4.9相加)(116)7.5×199(117)(数学公式+数学公式)×36
(118)1.2×5.7-1.2+5.3×1.2(119)0.825×102-82.5(120)46×数学公式(121)560÷16÷5
(122)3÷2.5(123)84+(54-16)(124)数学公式+数学公式+数学公式+数学公式(125)数学公式-(数学公式÷数学公式+数学公式
(126)3×(数学公式+数学公式)+数学公式(127)7.2÷(5-0.75+0.25)(128)725÷25+275÷25(129)数学公式×数学公式×数学公式
(130)数学公式×45-数学公式÷数学公式(131)48×(数学公式-数学公式(132)数学公式×数学公式+数学公式×数学公式(133)(32+数学公式)÷4
(134)数学公式÷数学公式÷数学公式(135)46×数学公式(136)数学公式×数学公式+数学公式÷9

解:(1)438+203,
=438+200+3,
=641;
(2)256+199,
=256+200-1,
=455;
(3)416-302,
=416-300-2,
=114;
(4)325-198,
=325-200+2,
=127;
(5)278+498,
=278+500-2,
=776;
(6)3.6+2.7+6.4+7.3,
=(3.6+6.4)+(2.7+7.3),
=10+10,
=20;
(7)+++
=()+(),
=1+3,
=4;
(8)1.3+4.25+3.7+3,
=(1.3+3.7)+(4.25+3),
=5+7.25,
=12.25;
(9)1874-324-476,
=1874-(324+476),
=1874-800,
=1074;
(10)5-1.4-1.6
=5-(1.4+1.6),
=5-3,
=2;
(11)30-8.12-4.13-7.75
=30-(8.12+4.13+7.75),
=30-20,
=10;
(11)-+
=+-
=1-
=
(12)4.3-2.45+5.7-6.55
=(4.3+5.7)-(2.45+6.55),
=10-9,
=1;
(13)125×48
=125×8×6,
=1000×6,
=6000;
(14)25×32
=25×4×8,
=100×8,
=800;
(15)35×1.4
=35×0.2×7,
=7×7,
=49;
(16)1.25×88
=1.25×(80+8),
=1.25×80+1.25×8,
=100+10,
=110;
(17)0.25×444
=0.25×4×111,
=111;
(18)32×0.25×12.5
=8×4×0.25×12.5,
=(8×12.5)×(4×0.25),
=100×1,
=100;
(19)25×80×0.04×125
=(125×80)×(25×0.04),
=10000×1,
=10000;
(20)1.9×4×0.5
=1.9×(4×0.5),
=1.9×2,
=3.8
(21)25×1.25×4×0.8
=(25×4)×(1.25×0.8),
=100×1,
=100;
(22)(1.6+1.6+1.6+1.6)×2.5
=1.6×(4×2.5),
=1.6×10,
=16;
(23)(0.7+0.7…+0.7)×12.5(80个0.7相加)
=80×0.7×12.5,
=80×12.5×0.7,
=1000×0.7,
=700;
(24)99×8.6+8.6
=(99+1)×8.6,
=100×8.6,
=860;
(25)99×5.4
=(100-1)×5.4,
=100×5.4-1×5.4,
=540-5.4,
=534.6;
(26)4.8×1.01
=4.8×(1+0.01),
=4.8×1+4.8×0.01,
=4.8+0.048,
=4.848;
(27)95×101-95
=95×(101-1),
=95×100,
=9500;
(28)95×102-190
=95×(100+2)-190,
=95×100+95×2-190,
=9500+190-190,
=9500;
(29)95.6×18+0.4×18
=18×(95.6+0.4),
=18×96,
=18×(100-4),
=18×100-18×4,
=1800-72,
=1728;
(30)(-+)×12
=×12×12×
=4-2+3,
=5;
(31)(+-)÷
=×24×24×24,
=8+3-1,
=10;
(32)24×(+-
=×24×24×24,
=8+3-1,
=10;
(33)24÷(+-
=24
=24×
=57.;
(34)1.25×3.6+1.25×+
=1.25×(3.6+3.4+1),
=1.25×8,
=10;
(35)3.3×+0.75×+75%
=0.75×(3.3+5.7+1),
=0.75×10,
=7.5;
(36)×6.6+7.5×
=6.6×(2.5+7.5),
=6.6×10,
=66;
(37)9.56×180-95.6×8
=9.56×180-9.56×80,
=9.56×(180-80),
=9.56×100,
=956;
(38)4.8×37+48×6.3
=48×3.7+48×6.3,
=48×(3.7+6.3),
=48×10,
=480;
(39)9.5×8.8+0.12×95
=(8.8+1.2)×9.5,
=10×9.5,
=950;
(40)×21
=×(20+1),
=×20+×1,
=19
(41)×33
=×(30+3),
=×30+×3,
=7+
=7
(42)÷
=
=
(43)÷
=×48,
=
(44)÷42,
=×
=
(45)6×0.75+5×-3÷4
=(6+5-1)×0.75,
=10×0.75,
=7.5;
(46)5.4÷1.2÷5
=5.4÷(1.2×5),
=5.4÷6,
=0.9;
(47)270÷18,
=15;
(48)120÷(1.2×4)
=120÷1.2÷4,
=100÷4,
=25;
(49)73÷0.8÷12.5
=73÷(0.8×12.5),
=73÷10,
=7.3;
(50)16÷2.5
=16÷(2.5×4)×4,
=16÷10×4,
=6.4;
(51)48÷1.25
=48÷(1.25×8)×8,
=48÷10×8,
=38.4;
(52)-(-)+
=-++
=
(53)84-(54-16)
=84-54+16,
=46;
(54)84-(54+16)
=84-70,
=14;
(55)9999×7778+3333×6666
=9999×7778+3333×3×2222,
=9999×7778+9999×2222,
=9999×(7778+2222),
=9999×10000,
=99990000;
(56)3.6×31.4+43.9×6.4
=3.6×(43.9-12.5)+43.9×6.4,
=439-3.6×12.5,
=439-45,
=394;
(57)(+)×
=×+×
=+2,
=5
(58)×+÷
=()×
=
(59)--
=-(+),
=-1,
=
(60)×-×
=×(),
=×
=
(61)×÷×
=÷×
=
(62)-×-
=-
=-(),
=-1,
=
(63)×[÷(+)]
=×[×+×7],
=×(+3),
=××3,
=
=
(64)(0.9+5)×3+2.3
=5.9×3+2.3,
=17.7+2.3,
=20;
(65)56×=

(66)+÷+
=+
=1
(67)(+)÷(+
=1÷1,
=1;
(68)÷(-
=×
=
(69)(-)÷
=×-×
=-
=
(70)7.2÷(5-0.75-0.25)
=7.2÷[5-(0.75+0.25)],
=7.2÷(5-1),
=7.2÷4,
=1.8;
(71)6.4+3.6÷0.5+4.5
=6.4+7.2+4.5,
=18.1;
(72)(6.4+3.6)÷0.5+4.5
=10÷0.5+4.5,
=20+4.5,
=24.5;
(73)495÷55+495÷45
=9+11,
=20;
(74)8÷0.4+8÷1.6
=20+5,
=25;
(75)0.9+99×0.9
=0.9×(1+99),
=0.9×100,
=90;
(76)5.28-(1.62+2.28)
=5.28-2.28-1.62,
=3-1.62,
=1.38;
(77)-+
=0+
=
(78)4×(+
=4×+4×
=
=
(79)+++
=()+(),
=1+1,
=2;
(80)2-(+)-
=2-
=2-(),
=2-1,
=1;
(81)×+×
=()×
=1×
=
(82)×+×
=()×
=1×
=
(83)×9+
=(9+1)×
=
(84)(20+)×
=20×+×
=14+
=14
(85)(5+)×
=5×+×
=4+
=4
(86)(+)×24
=×24+×24,
=4+3,
=7;
(87)×39×
=3×
=
(88)×(+
=××
=1+
=1
(89)(-)×12
=×12×12,
=3-2,
=1;
(90)×(26×
=××26,
=6;
(91)+++
=()+(),
=1+1,
=2;
(92)17×-
=(17-1)×
=16×
=6;
(93)(+)×
=××
=1+
=
(94)(+)÷
=×+×
=+1,
=1
(95)(+)÷3
=××
=
=
(96)(-)÷
=×9-×9,
=
=
(97)÷+÷
=()×
=
(98)×(10+
=×10+×
=8
=8
(99)(21+)÷
=21×+×
=15+
=15
(100)×+×
=()×
=1×
=
(101)÷+÷
=()×
=4×
=17;
(102)(-)÷
=×-
=
=
(103)×+
=
=
(104)-×-
=-
=-(),
=-1,
=
(105)-(÷+
=--
=1-
=
(106)+×+
=+(),
=+1,
=1
(107)1-÷-
=1-(),
=1-1,
=0;
(108)×+÷4
=()×
=1×
=
(109)5-(4+
=5-4-
=1-
=
(110)1125-997
=1125-1000+3,
=125+3,
=128;
(111)7.46-0.83-2.17
=7.46-(0.83+2.17),
=7.46-3,
=4.46;
(112)12.85-1.17-8.83+1.15
=(12.85+1.15)-(1.17+8.83),
=14-10,
=4;
(113)4.5×102
=4.5×(100+2),
=4.5×100+4.5×2,
=450+9,
=459;
(114)0.4×6.3×25
=0.4×25×6.3,
=10×6.3,
=63;
(115)(4.9+4.9+…+4.9)×2.5(16个4.9相加)
=4.9×16×2.5,
=4.9×(4×2.5×4),
=4.9×40,
=196;
(116)7.5×199
=7.5×(200-1),
=7.5×200-7.5×1,
=1500-7.5,
=1492.5;
(117)(+)×36
=×36,
=4+3,
=7;
(118)1.2×5.7-1.2+5.3×1.2
=(5.7+5.3-1)×1.2,
=10×1.2,
=12;
(119)0.825×102-82.5
=0.825×102-0.825×100,
=0.825×(102-100),
=0.825×2,
=1.65;
(120)46×=
(121)560÷16÷5
=560÷(16×5),
=560÷80,
=7;
(122)3÷2.5,
=1.2;
(123)84+(54-16)
=84+38,
=122;
(124)+++
=(+)+(+),
=1+1,
=2;
(125)-(÷+
=--
=1-
=
(126)3×(+)+
=3×
=(
=1+
=1
(127)7.2÷(5-0.75+0.25)
=7.2÷4.5,
=1.6;
(128)725÷25+275÷25
=(725+275)÷25,
=1000÷25,
=40;
(129)××
=××
=
=
(130)×45-÷
=×45-×45,
=0;
(131)48×(-
=48×
=40-18,
=22;
(132)×+×
=
=
(133)(32+)÷4
=32×
=8+
=8
(134)÷÷
=
=1;
(135)46×
=(45+1)×
=45×+
=2
(136)×+÷9
=()×
=1×
=
分析:本题按照先算乘除再算加减,有括号的先算括号里面的顺序运算.注意观察算式的特点,能运用运算定律简算,或者其它简便方法简算的要简算.
点评:本题是考察的基本运算法则,根据运算顺序计算.本题有很多可以简算,用相关的运算定律简算.
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相关题目
1.
(1)438+203 (2)256+199 (3)416-302 (4)325-198
(5)278+498 (6)3.6+2.7+6.4+7.3 (7)
4
9
+
5
6
+
5
9
+2
1
6
(8)1.3+4.25+3.7+3
(9)1874-324-476 (10)5-1.4-1.6 (11)30-8.12-4.13-7.75 (12)
7
8
-
4
5
+
1
8
(13)4.3-2.45+5.7-6.55 (14)125×48 (15)25×32 (16)35×1.4
(17)1.25×88 (18)0.25×444 (19)32×0.25×12.5 (20)25×80×0.04×125
(21)1.9×4×0.5 (22)25×1.25×4×0.8 (23)(1.6+1.6+1.6+1.6)×2.5 (24)(0.7+0.7…+0.7)×12.5(80个0.7相加)
(24)9.9×8.6+8.6 (25)99×5.4
(26)4.8×1.01 (27)95×101-95 (28)95×102-190 (29)95.6×18+0.4×18
(30)(
1
3
-
1
6
+
1
4
)×12
(31)(
1
3
+
1
8
-
1
24
)÷
1
24
(32)24×(
1
3
+
1
8
-
1
24
(33)24÷(
1
3
+
1
8
-
1
24
(34)1.25×3.6+1.25×3
2
5
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1
4
(35)3.3×
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+75%
(36)2
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3
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(37)9.56×180-95.6×8
(38)4.8×37+47×6.3 (39)9.5×8.8+0.12×95 (40)
19
20
×21
(41)
7
30
×33
(42)
2
45
÷
1
46
(43)
2
45
÷
1
48
(44)
2
45
÷42
(45)6×0.75+5×
3
4
-3÷4
(46)5.4÷1.2÷5 (47)270÷18 (48)120÷(1.2×4) (49)73÷0.8÷12.5
(50)16÷2.5 (51)48÷1.25 (52)
3
7
-(
1
2
-
3
7
)+
1
2
(53)84-(54-16)
(54)84-(54+16) (55)9999×7778+3333×6666 (56)3.6×31.4+43.9×6.4 (57)(
3
4
+
5
6
)×
12
5
(58)
7
9
×
13
14
+
2
9
÷
14
13
(59)
23
20
-
1
3
-
2
3
(60)
6
11
×
7
8
-
6
8
×
5
11
(61)
1
2
×
1
4
÷
1
2
×
1
4
(62)
25
17
-
1
3
×
9
8
-
5
8
(63)
8
9
×[
3
7
÷(
2
3
+
1
7
)]
(64)(0.9+5)×3+2.3 (65)56×
1
57
(66)
3
4
+
1
4
÷
3
4
+
1
4
(67)(
3
4
+
1
4
)÷(
3
4
+
1
4
(68)
7
15
÷(
7
30
-
1
15
(69)(
7
30
-
1
15
)÷
7
15
(70)7.2÷(5-0.75-0.25) (71)6.4+3.6÷0.5+4.5 (72)(6.4+3.6)÷0.5+4.5 (73)495÷55+495÷45
(74)8÷0.4+8÷1.6 (75)0.9+99×0.9 (76)5.28-(1.62+2.28) (77)
5
9
-
5
9
+
4
9
(78)4×(
3
8
+)
(79)
5
9
+
3
11
++
(80)2-(
1
2
+
1
25
)-
23
50
(81)
7
18
×
1
4
+
3
4
×
7
18
(82)
7
10
×
11
14
+
11
14
×
3
10
(83)
7
8
×9+
7
8
(84)(5+
5
16
)×
4
5
(85)(
1
6
+
1
8
)×24
(86)(20+
4
7
)×
7
10
(87)
1
13
×39×
8
21
(88)
7
3
×(
3
7
+
3
28
(89)(
1
4
-
1
6
)×12
(90)
40
13
×(26×
3
40
(91)
1
7
+
7
9
+
6
7
+
2
9
(92)17×
3
8
-
3
8
(93)(
8
5
+
8
3
)×
5
8
(94)(
13
24
+
13
16
)÷
13
16
(95)(
3
8
+
3
11
)÷3
(96)(
1
27
-
1
36
)÷
1
9
(97)
3
7
÷
7
11
+
4
7
÷
7
11
(98)
4
5
×(10+
5
6
(99)(21+
7
15
)÷
7
5
(100)
7
13
×
3
4
6
13
(101)
5
2
÷
4
17
+
3
2
÷
4
17
(102)(
5
18
-
5
24
)÷
5
6
(103)
2
3
×
7
3
+
4
5
+
(104)
25
17
_
1
3
×
9
8
-
5
8
(105)
12
7
-(
1
3
÷
7
15
+
4
13
(106)
5
7
+
9
8
×
5
9
+
3
8
(107)1-
5
8
÷
25
28
-
3
10
(108)
1
4
×
3
7
+÷4
(109)5-(4+
6
13
(110)1125-997 (111)7.46-0.83-2.17 (112)12.85-1.17-8.83+1.15 (113)4.5×102
(114)0.4×6.3×25 (115)(4.9+4.9+…+4.9)×2.5(16个4.9相加) (116)7.5×199 (117)(
1
9
+
1
12
)×36
(118)1.2×5.7-1.2+5.3×1.2 (119)0.825×102-82.5 (120)46×
2
45
(121)560÷16÷5
(122)3÷2.5 (123)84+(54-16) (124)
3
11
+
5
12
+
8
11
+
7
12
(125)
12
7
-(
1
3
÷
7
15
+
4
13
(126)3×(
1
12
+
2
15
)+
3
4
(127)7.2÷(5-0.75+0.25) (128)725÷25+275÷25 (129)
1
2
×
1
4
×
2
3
(130)
7
16
×45-
7
16
÷
1
45
(131)48×(
5
6
-
3
8
(132)
12
13
×
4
5
+
1
3
×
1
2
(133)(32+
4
7
)÷4
(134)
1
3
÷
3
8
÷
8
9
(135)46×
2
45
(136)
3
4
×
1
9
+
1
4
÷9

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