问题 解答题
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
答案

(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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