题目内容
| 47+256+53 | 368-152-48 | 25×17×4 |
| 2700÷25÷4 | 125×88 | 99×41+41 |
| 13×75+13×25 | 125×72 | 25×(4+8) |
分析:算式(1)可根据加法交换律进行计算;
算式(2)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质进行计算;
算式(3)可根据乘法交换律进行计算;
算式(4)可根据一个数除以两个数,等于用这个数除以这两个数的积的除法性质进行计算;
算式(5)可将式的88拆分为8×11进行计算;
算式(6)(7)(9)可根据乘法分配律进行计算;
算式(8)可将72拆分为8×9进行计算.
算式(2)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质进行计算;
算式(3)可根据乘法交换律进行计算;
算式(4)可根据一个数除以两个数,等于用这个数除以这两个数的积的除法性质进行计算;
算式(5)可将式的88拆分为8×11进行计算;
算式(6)(7)(9)可根据乘法分配律进行计算;
算式(8)可将72拆分为8×9进行计算.
解答:解:(1)47+256+53
=(47+53)+256,
=100+256,
=356;
(2)368-152-48
=368-(152+48),
=368-200,
=168;
(3)25×17×4
=25×4×17,
=100×17,
=1700;
(4)2700÷25÷4
=2700÷(25×4),
=2700÷100,
=27;
(5)125×88
=125×8×11,
=1000×11,
=11000;
(6)99×41+41
=(99+1)×41,
=100×41,
=4100;
(7)13×75+13×25
=(75+25)×13,
=100×13,
=1300;
(8)125×72
=125×8×9,
=1000×9,
=9000;
(9)25×(4+8),
=25×4+25×8,
=100+200,
=300.
=(47+53)+256,
=100+256,
=356;
(2)368-152-48
=368-(152+48),
=368-200,
=168;
(3)25×17×4
=25×4×17,
=100×17,
=1700;
(4)2700÷25÷4
=2700÷(25×4),
=2700÷100,
=27;
(5)125×88
=125×8×11,
=1000×11,
=11000;
(6)99×41+41
=(99+1)×41,
=100×41,
=4100;
(7)13×75+13×25
=(75+25)×13,
=100×13,
=1300;
(8)125×72
=125×8×9,
=1000×9,
=9000;
(9)25×(4+8),
=25×4+25×8,
=100+200,
=300.
点评:完成本题要注意分析式中数据的特点及内在联系,然后选择合适的方法进行计算.
练习册系列答案
相关题目
| (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) | (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) |
| (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)( | (31)( | (32)24×( | (33)24÷( |
| (34)1.25×3.6+1.25× | (35)3.3× | (36) | (37)9.56×180-95.6×8 |
| (38)4.8×37+47×6.3 | (39)9.5×8.8+0.12×95 | (40) | (41) |
| (42) | (43) | (44) | (45)6×0.75+5× |
| (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) | (53)84-(54-16) |
| (54)84-(54+16) | (55)9999×7778+3333×6666 | (56)3.6×31.4+43.9×6.4 | (57)( |
| (58) | (59) | (60) | (61) |
| (62) | (63) | (64)(0.9+5)×3+2.3 | (65)56× |
| (66) | (67)( | (68) | (69)( |
| (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) |
| (78)4×( | (79) | (80)2-( | (81) |
| (82) | (83) | (84)(5+ | (85)( |
| (86)(20+ | (87) | (88) | (89)( |
| (90) | (91) | (92)17× | (93)( |
| (94)( | (95)( | (96)( | (97) |
| (98) | (99)(21+ | (100) | (101) |
| (102)( | (103) | (104) | (105) |
| (106) | (107)1- | (108) | (109)5-(4+ |
| (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)( |
| (118)1.2×5.7-1.2+5.3×1.2 | (119)0.825×102-82.5 | (120)46× | (121)560÷16÷5 |
| (122)3÷2.5 | (123)84+(54-16) | (124) | (125) |
| (126)3×( | (127)7.2÷(5-0.75+0.25) | (128)725÷25+275÷25 | (129) |
| (130) | (131)48×( | (132) | (133)(32+ |
| (134) | (135)46× | (136) |