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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