题目内容
能简算的要简算.
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分析:(1)先算小括号里的加法,再算乘法,最后算加法,
(2)把除以7化成乘以
,再运用乘法的分配律进行简算,
(3)先算小括号里的加法,再把除法化成乘法进行约分计算即可,
(4)把除以5化成乘以
,再运用乘法的分配律进行简算,
(5)运用乘法的分配律进行简算,
(6)把百分数化成分数,再运用乘法的分配律进行简算.
(2)把除以7化成乘以
1 |
7 |
(3)先算小括号里的加法,再把除法化成乘法进行约分计算即可,
(4)把除以5化成乘以
1 |
5 |
(5)运用乘法的分配律进行简算,
(6)把百分数化成分数,再运用乘法的分配律进行简算.
解答:解:(1)
+(
+
)×
,
=
+
×
,
=
+
,
=
;
(2)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
÷(
+
)×
,
=
÷
×
,
=
×
×
,
=
;
(4)
×
-
÷5,
=
×
-
×
,
=(
-
)×
,
=1×
,
=
;
(5)
×58+
×41+
,
=
×(58+41+1),
=
×100,
=
;
(6)
×
+40%×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
2 |
3 |
4 |
7 |
1 |
2 |
7 |
25 |
=
2 |
3 |
15 |
14 |
7 |
25 |
=
2 |
3 |
3 |
10 |
=
29 |
30 |
(2)
8 |
13 |
1 |
7 |
5 |
13 |
=
8 |
13 |
1 |
7 |
1 |
7 |
5 |
13 |
=(
8 |
13 |
5 |
13 |
1 |
7 |
=1×
1 |
7 |
=
1 |
7 |
(3)
7 |
4 |
2 |
3 |
1 |
2 |
4 |
5 |
=
7 |
4 |
7 |
6 |
4 |
5 |
=
7 |
4 |
6 |
7 |
4 |
5 |
=
6 |
5 |
(4)
6 |
5 |
6 |
7 |
6 |
7 |
=
6 |
5 |
6 |
7 |
6 |
7 |
1 |
5 |
=(
6 |
5 |
1 |
5 |
6 |
7 |
=1×
6 |
7 |
=
6 |
7 |
(5)
1 |
8 |
1 |
8 |
1 |
8 |
=
1 |
8 |
=
1 |
8 |
=
25 |
2 |
(6)
2 |
5 |
1 |
5 |
4 |
5 |
=
2 |
5 |
1 |
5 |
2 |
5 |
4 |
5 |
=
2 |
5 |
1 |
5 |
4 |
5 |
=
2 |
5 |
=
2 |
5 |
点评:考查了分数、百分数的四则混合运算的顺序,注意灵活运用运算定律进行简算即可.
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