题目内容
(1)2.5×(
-
)+2.
(2)
÷
-
×
.
| 2 |
| 5 |
| 1 |
| 3 |
(2)
| 16 |
| 3 |
| 4 |
| 5 |
| 1 |
| 3 |
| 3 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)把小数化为分数,先算括号内的,再算括号外的乘法,最后算加法.
(2)先算除法和乘法,再算减法.
(2)先算除法和乘法,再算减法.
解答:
解:(1)2.5×(
-
)+2
=
×
+2
=
+2
=2
(2)
÷
-
×
=
×
-
=
-
=
| 2 |
| 5 |
| 1 |
| 3 |
=
| 5 |
| 2 |
| 1 |
| 15 |
=
| 1 |
| 6 |
=2
| 1 |
| 6 |
(2)
| 16 |
| 3 |
| 4 |
| 5 |
| 1 |
| 3 |
| 3 |
| 5 |
=
| 16 |
| 3 |
| 5 |
| 4 |
| 1 |
| 5 |
=
| 20 |
| 3 |
| 1 |
| 5 |
=
| 97 |
| 15 |
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.
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