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x + ax - y - ay =
X la a doua + 8x + 15=
a(x-y)+b(y-x) =


Răspuns :

a) x+ax-y-ay=x(1+a)-y(1+a)=(1+a)(x-y)
b) x²+8x+15=(x+3)x+5(x+3)=(x+3)(x+5)
c) a(x-y)+b(y-x)=a(x-y)-b(x-y)=(x-y)(a-b)