题目内容

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.
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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