题目内容
| 能简算的,写出简算过程. 2-(
|
| ||||||||||||||
(
|
|
分析:(1)(3)(4)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答.
(2)先运用减法性质,再依据四则运算计算顺序解答.
(2)先运用减法性质,再依据四则运算计算顺序解答.
解答:解:(1)2-(
+
)×
,
=2-
×
,
=2-
,
=1
;
(2)
×[
-(
-
)],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
;
(3)
+
-
,
=
-
,
=
;
(4)
÷(
-
×
),
=
÷(
-
),
=
÷
,
=
.
| 1 |
| 4 |
| 1 |
| 7 |
| 4 |
| 11 |
=2-
| 11 |
| 28 |
| 4 |
| 11 |
=2-
| 1 |
| 7 |
=1
| 6 |
| 7 |
(2)
| 4 |
| 27 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 27 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 4 |
| 27 |
| 7 |
| 16 |
=
| 4 |
| 27 |
| 9 |
| 16 |
=
| 1 |
| 12 |
(3)
| 5 |
| 6 |
| 3 |
| 8 |
| 5 |
| 12 |
=
| 29 |
| 24 |
| 5 |
| 12 |
=
| 19 |
| 24 |
(4)
| 4 |
| 15 |
| 13 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 4 |
| 15 |
| 13 |
| 9 |
| 5 |
| 9 |
=
| 4 |
| 15 |
| 8 |
| 9 |
=
| 3 |
| 10 |
点评:完成本题要注意分析式中数据,正确运用四则运算计算顺序及合适的简便方法计算.
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