题目内容

怎样简便怎样算.
(1)(
5
8
+
5
6
)×
4
25

(2)[12×(
2
3
+
1
4
)]÷
11
12

(3)
1
3
×
7
16
×
3
7

(4)
11
12
×11+
11
12

(5)86×
2
85
=
(1)(
5
8
+
5
6
)×
4
25

=
5
8
×
4
25
+
5
6
×
4
25

=
1
10
+
2
15

=
7
30


(2)[12×(
2
3
+
1
4
)]÷
11
12

=[12×
11
12
11
12

=11×
12
11

=12;

(3)
1
3
×
7
16
×
3
7
=
1
16


(4)
11
12
×11+
11
12

=
11
12
×(11+1),
=
11
12
×12,
=11;

(5)86×
2
85

=(85+1)×
2
85

=2+
2
85

=2
2
85
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