Question

a/a-b-a-b/a+b
Решите

Answer 1

a/a-b-a-b/a+b=a/a-(b·a/a)-(a·a/a)-b/a+(a·b/a)=a/a-ab/a-a²/a-b/a+ab/a=(a-ab-a²-b+ab)/a=(a-b-a²)/a