题目内容
(2011?滑县)
怎样简便就怎样算
|
5-
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|
[
|
分析:(1)先算乘法,再算加法;
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的除法.
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的除法.
解答:解:(1)
+
×3,
=
+
,
=
;
(2)5-
-0.125,
=5-(0.875+0.125),
=5-1,
=4;
(3)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)[
-(
-
)]÷
,
=[
-
]÷
,
=
÷
,
=
.
1 |
4 |
3 |
4 |
=
1 |
4 |
9 |
4 |
=
5 |
2 |
(2)5-
7 |
8 |
=5-(0.875+0.125),
=5-1,
=4;
(3)
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
=
7 |
9 |
5 |
11 |
2 |
9 |
5 |
11 |
=(
7 |
9 |
2 |
9 |
5 |
11 |
=1×
5 |
11 |
=
5 |
11 |
(4)[
1 |
2 |
3 |
4 |
3 |
5 |
7 |
10 |
=[
1 |
2 |
3 |
20 |
7 |
10 |
=
7 |
20 |
7 |
10 |
=
1 |
2 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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