题目内容
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(
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(
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分析:(1)从左往右依次运算;
(2)(4)(5)运用乘法分配律简算;
(3)运用乘法结合律简算.
(2)(4)(5)运用乘法分配律简算;
(3)运用乘法结合律简算.
解答:解:(1)
×
×
=
×
=
(2)
×
+
×
=
×(
+
)
=
×1
=
(3)
×5×
=
×(5×
)
=
×14
=10
(4)(
+
)×24
=
×24+
×24
=9+4
=13
(5)(
-
)×15
=
×15-
×15
=12-10
=2
| 8 |
| 25 |
| 3 |
| 4 |
| 5 |
| 6 |
=
| 6 |
| 25 |
| 5 |
| 6 |
=
| 1 |
| 5 |
(2)
| 2 |
| 15 |
| 1 |
| 6 |
| 5 |
| 6 |
| 2 |
| 15 |
=
| 2 |
| 15 |
| 1 |
| 6 |
| 5 |
| 6 |
=
| 2 |
| 15 |
=
| 2 |
| 15 |
(3)
| 5 |
| 7 |
| 14 |
| 5 |
=
| 5 |
| 7 |
| 14 |
| 5 |
=
| 5 |
| 7 |
=10
(4)(
| 3 |
| 8 |
| 1 |
| 6 |
=
| 3 |
| 8 |
| 1 |
| 6 |
=9+4
=13
(5)(
| 4 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 5 |
| 2 |
| 3 |
=12-10
=2
点评:考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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