题目内容
怎么简便就怎样算.
8×
+
×8;
×25×
×4;
×
-
÷
.
8×
| 2 |
| 5 |
| 3 |
| 5 |
| 7 |
| 3 |
| 6 |
| 7 |
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
| 4 |
| 3 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用乘法的分配律进行简算;
(2)运用乘法的交换律、结合律进行简算;
(3)把除以
化成乘以
,再运用乘法的分配律进行简算.
(2)运用乘法的交换律、结合律进行简算;
(3)把除以
| 4 |
| 3 |
| 3 |
| 4 |
解答:
解:(1)8×
+
×8
=8×(
+
)
=8×1
=8;
(2)
×25×
×4
=(
×
)×(4×25)
=2×100
=200;
(3)
×
-
÷
=
×
-
×
=
×(
-
)
=
×0
=0.
| 2 |
| 5 |
| 3 |
| 5 |
=8×(
| 2 |
| 5 |
| 3 |
| 5 |
=8×1
=8;
(2)
| 7 |
| 3 |
| 6 |
| 7 |
=(
| 7 |
| 3 |
| 6 |
| 7 |
=2×100
=200;
(3)
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
| 4 |
| 3 |
=
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 3 |
| 4 |
=0.
点评:此题考查了分数的四则混合运算,灵活运用乘法的运算定律进行简算即可.
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