题目内容
怎样简便怎样算.
-
÷
×
×12;
×
+
÷
.
| 1 |
| 2 |
| 5 |
| 14 |
| 10 |
| 21 |
| 6 |
| 11 |
| 4 |
| 3 |
| 8 |
| 5 |
| 11 |
| 3 |
| 5 |
| 8 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先把除法改为乘法,计算连乘,再算减法;
(2)利用乘法分配简算.
(2)利用乘法分配简算.
解答:
解:(1)
-
÷
×
×12
=
-
×
×
×12
=
-
=-
;
(2)
×
+
÷
=
×
+
×
=(
+
)×
=5×
=8.
| 1 |
| 2 |
| 5 |
| 14 |
| 10 |
| 21 |
| 6 |
| 11 |
=
| 1 |
| 2 |
| 5 |
| 14 |
| 21 |
| 10 |
| 6 |
| 11 |
=
| 1 |
| 2 |
| 54 |
| 11 |
=-
| 97 |
| 22 |
(2)
| 4 |
| 3 |
| 8 |
| 5 |
| 11 |
| 3 |
| 5 |
| 8 |
=
| 4 |
| 3 |
| 8 |
| 5 |
| 11 |
| 3 |
| 8 |
| 5 |
=(
| 4 |
| 3 |
| 11 |
| 3 |
| 8 |
| 5 |
=5×
| 8 |
| 5 |
=8.
点评:混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算即可.
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