题目内容

能简算的要简算.
3
7
÷
7
11
+
4
7
÷
7
11

(
1
3
-
1
4
)×12

5
2
+
5
2
×
3
5
+
2
5

15
16
×15+
15
16
(1)
3
7
÷
7
11
+
4
7
÷
7
11

=(
3
7
+
4
7
)÷
7
11

=1×
11
7

=
11
7


(2)(
1
3
-
1
4
)×12,
=
1
3
×12-
1
4
×12,
=4-3,
=1;

(3)
5
2
+
5
2
×
3
5
+
2
5

=
5
2
+
3
2
+
2
5

=4+
2
5

=4
2
5


(4)
15
16
×15+
15
16

=
15
16
×(15+1),
=
15
16
×16,
=15.
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