题目内容
脱式计算
(
-
)÷
×
;[1-(
+
)]÷
.
(
| 6 |
| 5 |
| 13 |
| 20 |
| 11 |
| 100 |
| 2 |
| 5 |
| 2 |
| 5 |
| 9 |
| 20 |
| 3 |
| 20 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)把除以
化成乘以
,再运用乘法的分配律进行简算;
(2)先算小括号里的加法,再算中括号里的减法,最后算括号外的除法.
| 11 |
| 100 |
| 100 |
| 11 |
(2)先算小括号里的加法,再算中括号里的减法,最后算括号外的除法.
解答:
解:(1)(
-
)÷
×
=(
-
)×
×
=
×
×
-
×
×
=
-
=2;
(2)[1-(
+
)]÷
=[1-
]÷
=
÷
=1.
| 6 |
| 5 |
| 13 |
| 20 |
| 11 |
| 100 |
| 2 |
| 5 |
=(
| 6 |
| 5 |
| 13 |
| 20 |
| 100 |
| 11 |
| 2 |
| 5 |
=
| 6 |
| 5 |
| 100 |
| 11 |
| 2 |
| 5 |
| 13 |
| 20 |
| 100 |
| 11 |
| 2 |
| 5 |
=
| 48 |
| 11 |
| 26 |
| 11 |
=2;
(2)[1-(
| 2 |
| 5 |
| 9 |
| 20 |
| 3 |
| 20 |
=[1-
| 17 |
| 20 |
| 3 |
| 20 |
=
| 3 |
| 20 |
| 3 |
| 20 |
=1.
点评:此题主要考查分数的四则混合运算的运算顺序以及计算能力.
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