题目内容
简便计算.
|
(
|
|
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)(3)运用乘法分配律简算.
(2)(3)运用乘法分配律简算.
解答:解:(1)
÷3+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)(
+
)×36,
=
×36+
×36,
=20+30,
=50;
(3)
×101,
=
×(100+1),
=
×100+
×1,
=70+
,
=70
.
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 3 |
| 4 |
| 5 |
| 1 |
| 3 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=1×
| 1 |
| 3 |
=
| 1 |
| 3 |
(2)(
| 5 |
| 9 |
| 5 |
| 6 |
=
| 5 |
| 9 |
| 5 |
| 6 |
=20+30,
=50;
(3)
| 7 |
| 10 |
=
| 7 |
| 10 |
=
| 7 |
| 10 |
| 7 |
| 10 |
=70+
| 7 |
| 10 |
=70
| 7 |
| 10 |
点评:乘法分配律是常用的简便运算的方法,要熟练掌握,灵活运用.
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