Question

Помогите а 113 и 159 прошу

Answer 1

20/21+1/3-8/63-6/7+1/9=
=60/63+21/63-8/63-54/63+7/63=
=26/63

98,4-3,6=94,8
4,98-3,2=1,78
-4,88-29,4=24,52
0,144--2,5=-1,356