题目内容
用简便方法计算
57×10.1
8.6×18-8
×8
5.39+
+3.61+1
23×75%+17×
.
57×10.1
8.6×18-8
3 |
5 |
5.39+
2 |
7 |
5 |
7 |
23×75%+17×
3 |
4 |
考点:运算定律与简便运算
专题:运算定律及简算
分析:(1)把10.1分解成10+0.1,再根据乘法分配律进行计算;
(2)把8
化成小数,再根据乘法分配律进行计算;
(3)根据加法交换律和加法结合律进行计算;
(4)把75%、
化成小数,再根据乘法分配律进行计算.
(2)把8
3 |
5 |
(3)根据加法交换律和加法结合律进行计算;
(4)把75%、
3 |
4 |
解答:
解:(1)57×10.1
=57×(10+0.1)
=57×10+57×0.1
=570+5.7
=575.7;
(2)8.6×18-8
×8
=8.6×18-8.6×8
=8.6×(18-8)
=8.6×10
=86;
(3)5.39+
+3.61+1
=(5.39+3.61)+(
+1
)
=9+2
=11;
(4)23×75%+17×
=23×0.75+17×0.75
=(23+17)×0.75
=40×0.75
=30.
=57×(10+0.1)
=57×10+57×0.1
=570+5.7
=575.7;
(2)8.6×18-8
3 |
5 |
=8.6×18-8.6×8
=8.6×(18-8)
=8.6×10
=86;
(3)5.39+
2 |
7 |
5 |
7 |
=(5.39+3.61)+(
2 |
7 |
5 |
7 |
=9+2
=11;
(4)23×75%+17×
3 |
4 |
=23×0.75+17×0.75
=(23+17)×0.75
=40×0.75
=30.
点评:本题主要考查了学生根据题目特点采用不同的方法来进行简便计算的能力.
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