题目内容
| 怎样计算简便就怎样计算. 5
|
(
| ||||||||||||||
2-
|
1
| ||||||||||||||
|
32×(1-
|
分析:(1)(2)可根据乘法分配律计算;
(3)可根据一个减两个数,等于减去这两个数的和的减法性质计算;
其余算式根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(3)可根据一个减两个数,等于减去这两个数的和的减法性质计算;
其余算式根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)5
×3
+5
÷
=5
×
+5
×
,
=5
×(
+
),
=(5+
)×5,
=5×5+
×5,
=25+
,
=25
;
(2)(
-
+
)×24
=
×24-
×24+
×24,
=18-16+4,
=6;
(3)2-
÷
-
=2-
-
,
=2-(
+
),
=2-2,
=0;
(4)1
×
÷2
=
×
×
,
=
×
,
=
;
(5)
×
÷(
+
)
=
×
×
,
=
;
(6)32×(1-
)-
=32×
-
,
=12-
,
=11
.
| 2 |
| 11 |
| 3 |
| 4 |
| 2 |
| 11 |
| 4 |
| 5 |
=5
| 2 |
| 11 |
| 15 |
| 4 |
| 2 |
| 11 |
| 5 |
| 4 |
=5
| 2 |
| 11 |
| 15 |
| 4 |
| 5 |
| 4 |
=(5+
| 2 |
| 11 |
=5×5+
| 2 |
| 11 |
=25+
| 10 |
| 11 |
=25
| 10 |
| 11 |
(2)(
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=18-16+4,
=6;
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0;
(4)1
| 1 |
| 6 |
| 4 |
| 7 |
| 2 |
| 3 |
=
| 7 |
| 6 |
| 4 |
| 7 |
| 3 |
| 8 |
=
| 2 |
| 3 |
| 3 |
| 8 |
=
| 1 |
| 4 |
(5)
| 1 |
| 3 |
| 38 |
| 45 |
| 5 |
| 2 |
| 2 |
| 3 |
=
| 1 |
| 3 |
| 38 |
| 45 |
| 6 |
| 19 |
=
| 4 |
| 45 |
(6)32×(1-
| 5 |
| 8 |
| 8 |
| 13 |
=32×
| 3 |
| 8 |
| 8 |
| 13 |
=12-
| 8 |
| 13 |
=11
| 5 |
| 13 |
点评:完成本题要注意分析式中数据的特点及内在联系,然后运用合适的方法进行计算.
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