10/13÷219/22−12/5×11/13+7+1/5×22/63=_．

题目

10

13

答案

10

13

÷2

19

22

−1

2

5

×

11

13

+7+

1

5

×

22

63

=

10

13

×

22

63

-

7

5

×

11

13

+7+

1

5

×

22

63

=（

10

13

+

1

5

）×

22

63

-

7

5

×

11

13

+7
=

63

65

×

22

63

-

7

5

×

11

13

+7
=

22

65

-1

12

65

+7
=6

2

13

．