Matematika

Pertanyaan

1) a+b/a - a/a+b - ab/a-b =

2) 1/a-1/b / 1/b-1/a =

3) x/2y-2y/x / 1/2y-1/x =

4) 1/c-1/b / (c-b) =

Pleasee Bantuin :(
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