1)(x²-y²):(x+y)²=(x+y)(x-y):(x+y)(x+y)=(x-y):(x+y) , x+y≠0
2)(x-y)²:(x²-y²)=(x-y)(x-y):(x+y)(x-y)=(x-y):(x+y) , x+y≠0
3)(x²-9):(x²+6x+9)=(x²-3²):(x+3)²=(x+3)(x-3):(x+3)(x+3)=(x-3):(x+3), x≠-3
4)(x²-10x+25):(x²-25)=(x-5)²:(x+5)(x-5)=
=(x-5):(x+5) , x≠5,x≠-5
(A²-B²=(A+B)(A-B) , A²+2AB+B²=(A+B)²)
1)(x²-y²):(x+y)²=(x+y)(x-y):(x+y)(x+y)=(x-y):(x+y) , x+y≠0
2)(x-y)²:(x²-y²)=(x-y)(x-y):(x+y)(x-y)=(x-y):(x+y) , x+y≠0
3)(x²-9):(x²+6x+9)=(x²-3²):(x+3)²=(x+3)(x-3):(x+3)(x+3)=(x-3):(x+3), x≠-3
4)(x²-10x+25):(x²-25)=(x-5)²:(x+5)(x-5)=
=(x-5):(x+5) , x≠5,x≠-5
(A²-B²=(A+B)(A-B) , A²+2AB+B²=(A+B)²)