题目内容
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|
(
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分析:(1)把除法改为乘法,运用乘法分配律简算;
(2)先算除法,然后运用加法交换律与结合律简算;
(3)两个括号同时计算,最后算乘法.
(2)先算除法,然后运用加法交换律与结合律简算;
(3)两个括号同时计算,最后算乘法.
解答:解:(1)
÷5+
×
=
×
+
×
=(
+
)×
=1×
=
(2)
÷
+
+
=
×
+
+
=
+
+
=(
+
)+
=1+
=1
(3)(
+
)×(
-
)
=
×
=
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=(
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=1×
| 1 |
| 5 |
=
| 1 |
| 5 |
(2)
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 9 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
(3)(
| 5 |
| 9 |
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 16 |
=
| 11 |
| 9 |
| 9 |
| 16 |
=
| 11 |
| 16 |
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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