问题 解答题
计算,能简算的用简便方法计算.
125×8.08
86×15-380
79×25+20×79+79×55
3
7
×(
4
5
-
2
3

7
13
×
8
5
÷
14
39

[
3
5
-(
3
4
-
2
5
)]÷4.
答案

125×8.08,

=125×8+125×0.08,

=1000+10,

=1010,

86×15-380,

=1290-380,

=910,

79×25+20×79+79×55,

=79×(25+20+55),

=79×100,

=7900,

3
7
×(
4
5
-
2
3

=

3
7
×(
12
15
-
10
15
),

=

3
7
×
2
15

=

2
35

7
13
×
8
5
÷
14
39

=

7
13
×
8
5
×
39
14

=

12
5

[

3
5
-(
3
4
-
2
5
)]÷4,

=[

3
5
+
2
5
-
3
4
]÷4.

=

1
4
×
1
4

=

1
16

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