题目内容
计算有捷径.
|
|
|
分析:(1)从左往右依次运算;
(2)运用乘法分配律简算;
(3)运用乘法结合律简算.
(2)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
| 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
点评:此题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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