(a+b)^2/ab-(a-b)^2/ab
a^2+2ab+b^2/ab-a^2-2ab+b^2/ab
a^2+2ab+b^2-(a^2-2ab-b^2)/ab
a^2+2ab+b^2-a^2+2ab-b^2/ab
2ab+b^2+2ab-b^2/ab
2ab+2ab/ab
4ab/ab
4
Объяснение:
(a+b)^2/ab-(a-b)^2/ab
a^2+2ab+b^2/ab-a^2-2ab+b^2/ab
a^2+2ab+b^2-(a^2-2ab-b^2)/ab
a^2+2ab+b^2-a^2+2ab-b^2/ab
2ab+b^2+2ab-b^2/ab
2ab+2ab/ab
4ab/ab
4
Объяснение: