题目内容
计算:
(1)
÷
÷
;
(2)
÷
+
×
.
(1)
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 6 |
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 5 |
| 11 |
| 2 |
| 9 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)连乘或连除的算式属于同级运算,根据四则混合运算的运算顺序可知,同一级运算顺序是从左到右进行计算.
(2)先把除法转化为乘法,再运用乘法分配律简算;
(2)先把除法转化为乘法,再运用乘法分配律简算;
解答:
解:
(1)
÷
÷
=
×
×
=
(2)
÷
+
×
=
×
+
×
=(
+
)×
=
×
=1×
=
(1)
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 6 |
=
| 4 |
| 5 |
| 8 |
| 3 |
| 6 |
| 7 |
=
| 64 |
| 35 |
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 5 |
| 11 |
| 2 |
| 9 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 5 |
| 11 |
| 2 |
| 9 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 9 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
点评:四则混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当运用运算定律进行简算.
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