题目内容
计算下面各题,能简算的要简算.
20×
|
|
23.6×10%+13.6×910% | (
|
分析:(1)根据乘法分配律进行简算即可;
(2)根据乘法分配律进行简算即可;
(3)先算乘法,再算加法;
(4)先算小括号里面的减法,再算乘法.
(2)根据乘法分配律进行简算即可;
(3)先算乘法,再算加法;
(4)先算小括号里面的减法,再算乘法.
解答:解:
(1)20×
+4×
,
=(20+4)×
,
=24×
,
=14;
(2)
÷
+4×
,
=
×4+4×
,
=(
+
)×4,
=1×4,
=4;
(3)23.6×10%+13.6×910%,
=2.36+123.76,
=126.12;
(4)(
-
)×
×8,
=
×
×8,
=
.
(1)20×
| 7 |
| 12 |
| 7 |
| 12 |
=(20+4)×
| 7 |
| 12 |
=24×
| 7 |
| 12 |
=14;
(2)
| 5 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
=(
| 5 |
| 8 |
| 3 |
| 8 |
=1×4,
=4;
(3)23.6×10%+13.6×910%,
=2.36+123.76,
=126.12;
(4)(
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 1 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 2 |
点评:根据题意,先找清运算顺序,然后再进一步计算即可,能简算的要简算.
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