Question

y²- x²/x²-2xy+y² решите

Answer 1

(y²-x²)/(x²-2xy+y²)=(y+x)(y-x)/(x-y)(x-y)=
=-(x+y)(x-y)/(x-y)(x,y)=-(x+y)/(x-y) , x≠y

(A²-B²)=(A+B)(A-B)
A²-2AB+B²=(A-B)²=(A-B)(A-B)
A-B=-(B-A)

Answer 2

Net za čto. Do cvidanija!