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Vă rog e urgent ☺☺☺☺

Vă Rog E Urgent class=

Răspuns :

x²-y²=(x-y)(x+y)=(x-y)*5=15
deci x-y=15:5=3
atunci
x-y+(x-y)²+(x-y)³=3+3²+3³=3+9+27=29
as simple as that!!