题目内容
脱式计算,能简算的要简算. 80-
|
35×75%+66×
| ||||||||
|
|
分析:(1)根据四则混合运算的计算顺序进行计算,
(2)根据乘法分配律进行计算,
(3)根据四则混合运算的计算顺序进行计算,
(4)根据乘法分配律进行计算.
(2)根据乘法分配律进行计算,
(3)根据四则混合运算的计算顺序进行计算,
(4)根据乘法分配律进行计算.
解答:解:(1)80-
×
+40×80%,
=80-
+32,
=111
;
(2)35×75%+66×
-0.75,
=35×0.75+66×0.75-0.75,
=(35+66-1)×0.75,
=100×0.75,
=75;
(3)
÷[
×(1-20%)],
=
÷[
×
],
=
÷
,
=
;
(4)
×27+
×41,
=
×27+
×3×41,
=
×(27+123),
=
×150,
=30.
5 |
4 |
4 |
15 |
=80-
1 |
3 |
=111
2 |
3 |
(2)35×75%+66×
3 |
4 |
=35×0.75+66×0.75-0.75,
=(35+66-1)×0.75,
=100×0.75,
=75;
(3)
4 |
5 |
5 |
8 |
=
4 |
5 |
5 |
8 |
4 |
5 |
=
4 |
5 |
1 |
2 |
=
8 |
5 |
(4)
1 |
5 |
3 |
5 |
=
1 |
5 |
1 |
5 |
=
1 |
5 |
=
1 |
5 |
=30.
点评:本题主要考查了学生在四则混合运算中灵活运用简便算法的能力,注意计算结果的准确性.
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