Хелп ми, плиз! Даю 20 баллов

Question

Хелп ми, плиз! Даю 20 баллов

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Answer 1

(a²+2ab+b²)/ab - (a²-2ab+b²)/ab = 4

(a²+2ab+b²-a²+2ab-b²)/ab = 4ab/ab = 4