题目内容
脱式计算:
(
-
)÷ 3
[1-(
-
)]×
.
(
| 8 |
| 15 |
| 1 |
| 5 |
[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
分析:(1)先算括号里面的减法,再算括号外面的除法;
(2)先算小括号里的减法,再算中括号里的减法,最后算括号外面的乘法.
(2)先算小括号里的减法,再算中括号里的减法,最后算括号外面的乘法.
解答:解:(1)(
-
)÷ 3,
=
÷3,
=
;
(2)[1-(
-
)]×
,
=【1-
】×
,
=
×
,
=
.
| 8 |
| 15 |
| 1 |
| 5 |
=
| 1 |
| 3 |
=
| 1 |
| 9 |
(2)[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
=【1-
| 1 |
| 4 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
点评:此题考查分数的四则混合运算的运算顺序:先算括号里面的运算,再算括号外面的运算.
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