题目内容
能简便算就简便:
×
+
÷
×(
+
)+
×
÷(
-
)
×1.25+
×2.2-
×8×
×1.25
4-
4÷4-
÷[(
+
)×
]
4.8+1.2×3.5÷1.4
1.8÷0.25+8.2×4
40
-35.75-4.25
164÷
-0.75×39-0.75
15×
+
÷16
3.64×[1÷(
-2.09)]
×
+
÷
.
| 2 |
| 5 |
| 3 |
| 7 |
| 4 |
| 7 |
| 5 |
| 2 |
| 12 |
| 5 |
| 1 |
| 6 |
| 1 |
| 4 |
| 11 |
| 13 |
| 1 |
| 4 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
| 9 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
| 13 |
| 5 |
| 8 |
| 13 |
4-
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
4.8+1.2×3.5÷1.4
1.8÷0.25+8.2×4
40
| 5 |
| 7 |
164÷
| 4 |
| 5 |
15×
| 4 |
| 21 |
| 8 |
| 7 |
3.64×[1÷(
| 21 |
| 10 |
| 5 |
| 7 |
| 2 |
| 3 |
| 14 |
| 15 |
| 1 |
| 9 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律简算即可;
(2)(3)首先计算小括号里面的,然后从左向右依次计算即可;
(4)(9)(11)根据乘法分配律简算即可;
(5)根据乘法交换律和结合律简算即可;
(6)(8)(12)(14)首先计算二级运算,然后计算一级运算即可;
(7)首先计算小括号里面的,然后根据除法的性质简算即可;
(10)根据减法的性质简算即可;
(13)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可.
(2)(3)首先计算小括号里面的,然后从左向右依次计算即可;
(4)(9)(11)根据乘法分配律简算即可;
(5)根据乘法交换律和结合律简算即可;
(6)(8)(12)(14)首先计算二级运算,然后计算一级运算即可;
(7)首先计算小括号里面的,然后根据除法的性质简算即可;
(10)根据减法的性质简算即可;
(13)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可.
解答:
解:(1)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
(2)
×(
+
)+
=
×
+
=1+
=1
(3)
×
÷(
-
)
=
÷
=
(4)
×1.25+
×2.2-
=(
+2.2-1)×
=3×
=3
(5)
×8×
×1.25
=
×
×(1.25×8)
=1.6×10
=16
(6)4-
×4÷4-
=4-0.8-0.8
=3.2-0.8
=2.4
(7)
÷[(
+
)×
]
=
÷[
×
]
=
÷
÷
=
×
=3
(8)4.8+1.2×3.5÷1.4
=4.8+4.2÷1.4
=4.8+3
=7.8
(9)1.8÷0.25+8.2×4
=1.8×4+8.2×4
=(1.8+8.2)×4
=10×4
=40
(10)40
-35.75-4.25
=40
-(35.75+4.25)
=40
-40
=
(11)164÷
-0.75×39-0.75
=205-0.75×(39+1)
=205-0.75×40
=205-30
=175
(12)15×
+
÷16
=
+
=2
(13)3.64×[1÷(
-2.09)]
=3.64×[1÷0.01]
=3.64×100
=364
(14)
×
+
÷
=
+
=8
| 2 |
| 5 |
| 3 |
| 7 |
| 4 |
| 7 |
| 5 |
| 2 |
=
| 2 |
| 5 |
| 3 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
=1×
| 2 |
| 5 |
=
| 2 |
| 5 |
(2)
| 12 |
| 5 |
| 1 |
| 6 |
| 1 |
| 4 |
| 11 |
| 13 |
=
| 12 |
| 5 |
| 5 |
| 12 |
| 11 |
| 13 |
=1+
| 11 |
| 13 |
=1
| 11 |
| 13 |
(3)
| 1 |
| 4 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
=
| 1 |
| 6 |
| 4 |
| 15 |
=
| 5 |
| 8 |
(4)
| 9 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
=(
| 9 |
| 5 |
| 5 |
| 4 |
=3×
| 5 |
| 4 |
=3
| 3 |
| 4 |
(5)
| 13 |
| 5 |
| 8 |
| 13 |
=
| 13 |
| 5 |
| 8 |
| 13 |
=1.6×10
=16
(6)4-
| 4 |
| 5 |
| 4 |
| 5 |
=4-0.8-0.8
=3.2-0.8
=2.4
(7)
| 5 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 9 |
| 20 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
| 9 |
| 20 |
=
| 5 |
| 3 |
| 20 |
| 9 |
=3
| 19 |
| 27 |
(8)4.8+1.2×3.5÷1.4
=4.8+4.2÷1.4
=4.8+3
=7.8
(9)1.8÷0.25+8.2×4
=1.8×4+8.2×4
=(1.8+8.2)×4
=10×4
=40
(10)40
| 5 |
| 7 |
=40
| 5 |
| 7 |
=40
| 5 |
| 7 |
=
| 5 |
| 7 |
(11)164÷
| 4 |
| 5 |
=205-0.75×(39+1)
=205-0.75×40
=205-30
=175
(12)15×
| 4 |
| 21 |
| 8 |
| 7 |
=
| 20 |
| 7 |
| 1 |
| 14 |
=2
| 13 |
| 14 |
(13)3.64×[1÷(
| 21 |
| 10 |
=3.64×[1÷0.01]
=3.64×100
=364
(14)
| 5 |
| 7 |
| 2 |
| 3 |
| 14 |
| 15 |
| 1 |
| 9 |
=
| 10 |
| 21 |
| 42 |
| 5 |
=8
| 92 |
| 105 |
点评:此题主要考查了整数、分数小数四则混合运算,注意运算顺序,注意乘法运算定律、除法的性质的应用.
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