题目内容
计算下面各题,能简算的要简算.
5.625-(1
|
(
|
|
分析:(1)根据减法的性质简算;
(2)先算小括号里面的减法,再算括号外的乘法;
(3)先算把中括号里面的计算根据减法的性质简算,再算括号外的除法.
(2)先算小括号里面的减法,再算括号外的乘法;
(3)先算把中括号里面的计算根据减法的性质简算,再算括号外的除法.
解答:解:(1)5.625-(1
+2.625),
=5.625-2.625-1
,
=3-1
,
=1
;
(2)(
-0.5)×
,
=
×
,
=
;
(3)
÷[
-(
+
)],
=
÷[
-
-
],
=
÷[
-
],
=
÷
,
=
.
5 |
6 |
=5.625-2.625-1
5 |
6 |
=3-1
5 |
6 |
=1
1 |
6 |
(2)(
5 |
6 |
9 |
10 |
=
1 |
3 |
9 |
10 |
=
3 |
10 |
(3)
2 |
9 |
5 |
6 |
1 |
6 |
1 |
3 |
=
2 |
9 |
5 |
6 |
1 |
6 |
1 |
3 |
=
2 |
9 |
2 |
3 |
1 |
3 |
=
2 |
9 |
1 |
3 |
=
2 |
3 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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