Question

Помогите пожалуйста!!!! Очень срочно!!

Answer 1

3/(x+y)²-4/(x-y)²+5/(x+y)(x-y)=[3(x-y)²-4(x+y)²+5(x²-y²)]/(x²-y²)²=
=(3x²-6xy+3y²-4x²-8xy-4y²+5x²-5y²)/(x²-y²)²=(4x²-14xy-6y²)/(x²-y²)²