题目内容
计算,能简便的要简便算.
|
| ||||||||||||||||||||||
(
|
3
|
分析:(1)运用加减、乘除法的计算法则进行计算,先算括号内部的在计算括号外面的.
(2)先把除号为乘号,再运用乘法的分配律进行计算.
(3)把括号外的除以这个数变为乘以这个数,然后再运用乘法的分配律进行计算.
(4)这道题运用c-(a+b)=c-a-b进行计算,使计算更加简便.
(5)把分数转化成小数,把37.5转化成3.75×10,然后再运用乘法的分配律进行计算.
(2)先把除号为乘号,再运用乘法的分配律进行计算.
(3)把括号外的除以这个数变为乘以这个数,然后再运用乘法的分配律进行计算.
(4)这道题运用c-(a+b)=c-a-b进行计算,使计算更加简便.
(5)把分数转化成小数,把37.5转化成3.75×10,然后再运用乘法的分配律进行计算.
解答:解:(1)
-(
÷
-
),
=
-(
×
-
),
=
-(
-
),
=
-
,
=
-
,
=
,
=3
;
(2)
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)(
+
+
)÷
,
=
×18+
×18+
×18,
=6+3+2,
=11;
(4)
-(
+
),
=
-
-
,
=1-
,
=
;
(5)3
×9.7+37.5×0.13-15÷4,
=3.75×9.7+3.75×1.3-3.75,
=3.75×(9.7+1.3-1),
=3.75×10,
=37.5.
| 25 |
| 6 |
| 24 |
| 5 |
| 8 |
| 5 |
| 7 |
| 3 |
=
| 25 |
| 6 |
| 24 |
| 5 |
| 5 |
| 8 |
| 7 |
| 3 |
=
| 25 |
| 6 |
| 9 |
| 3 |
| 7 |
| 3 |
=
| 25 |
| 6 |
| 2 |
| 3 |
=
| 25 |
| 6 |
| 4 |
| 6 |
=
| 21 |
| 6 |
=3
| 1 |
| 2 |
(2)
| 18 |
| 23 |
| 8 |
| 5 |
| 18 |
| 23 |
| 3 |
| 8 |
=
| 18 |
| 23 |
| 5 |
| 8 |
| 18 |
| 23 |
| 3 |
| 8 |
=
| 18 |
| 23 |
| 5 |
| 8 |
| 3 |
| 8 |
=
| 18 |
| 23 |
=
| 18 |
| 23 |
(3)(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 18 |
=
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
=6+3+2,
=11;
(4)
| 5 |
| 4 |
| 3 |
| 7 |
| 1 |
| 4 |
=
| 5 |
| 4 |
| 1 |
| 4 |
| 3 |
| 7 |
=1-
| 3 |
| 7 |
=
| 4 |
| 7 |
(5)3
| 3 |
| 4 |
=3.75×9.7+3.75×1.3-3.75,
=3.75×(9.7+1.3-1),
=3.75×10,
=37.5.
点评:按照分数乘除法的计算法则进行计算,灵活的运用乘法的分配律进行计算.
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