题目内容
怎样简便就怎样计算.
|
8×(
|
|
分析:运用乘法分配律解答.
解答:解:
×8-
,
=
×(8-1),
=
×7,
=5;
8×(
+
),
=8×
+8×
,
=
+7,
=7
;
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 5 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
=5;
8×(
| 1 |
| 16 |
| 7 |
| 8 |
=8×
| 1 |
| 16 |
| 7 |
| 8 |
=
| 1 |
| 2 |
=7
| 1 |
| 2 |
| 2 |
| 3 |
| 5 |
| 8 |
| 1 |
| 3 |
| 5 |
| 8 |
=(
| 2 |
| 3 |
| 1 |
| 3 |
| 5 |
| 8 |
=1×
| 5 |
| 8 |
=
| 5 |
| 8 |
点评:本题主要考查学生运用乘法分配律解决问题的能力.
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