7/8 + ( 1/8 + 1/9 )

9/7 - ( 2/7 – 10/2 1 )

5/8+5/6+ 1/9

240/400+ 12/400- 150/400

186/24+88/24-252/24

14/3-(385/42-270/42)

3/5× 17+3/5×8

12×(2/3+ 1/6)

9/ 1 1×4/5+9/ 1 1÷5

1/5÷3+4/5× 1/3

(7/8-5/6)×24

1 1/ 12×3/4+ 1 1/ 12× 1/4

7/20×(20-4/7)

(8/9+6/5)÷ 1/ 18

18×4/7+4/7× 17

4/9÷9+3/7× 1/9, 4, there are 200 calculation problems in the addition and subtraction of the scores of the people's education edition in the fifth grade of primary school.

(Add and subtract three scores)