题目内容
能简便的用简便方法计算. 30×(
|
|
5÷
| ||||||||||||||||||||||||
|
|
|
分析:(1)(4)可根据乘法分配律计算;
(2)(3)(5)(6)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.
(2)(3)(5)(6)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)30×(
+
)
=30×
+30×
,
=18+5,
=23;
(2)
÷[
×(
-
)]
=
÷[
×
],
=
×4,
=
;
(3)5÷
+
÷5
=6+
,
=6
;
(4)
÷
+
×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
×(
-
)÷
=
×
×
,
=
;
(6)
×
-
÷
=
-
,
=
.
3 |
5 |
1 |
6 |
=30×
3 |
5 |
1 |
6 |
=18+5,
=23;
(2)
2 |
3 |
9 |
14 |
5 |
6 |
4 |
9 |
=
2 |
3 |
9 |
14 |
7 |
18 |
=
2 |
3 |
=
8 |
3 |
(3)5÷
5 |
6 |
5 |
6 |
=6+
1 |
6 |
=6
1 |
6 |
(4)
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 |
(5)
3 |
4 |
7 |
15 |
1 |
5 |
2 |
3 |
=
3 |
4 |
4 |
15 |
3 |
2 |
=
3 |
10 |
(6)
8 |
15 |
3 |
4 |
1 |
6 |
1 |
2 |
=
2 |
5 |
1 |
3 |
=
1 |
15 |
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法进行计算.
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