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Ex 13( e, f) va rog ajutatima dau coroana

Ex 13 E F Va Rog Ajutatima Dau Coroana class=

Răspuns :

e)

(a+2)(a²-2a+4)=

a(a²-2a+4)+2(a²-2a+4)=

a³-2a²+4a+2(a²-2a+4)=

a³-2a²+4a+2a²-4a+8=

a³+(-2a²+2a²)+(4a-4a)+8=

a³+8


f)

(x+1)(x²-x+1)=

x(x²-x+1)+x²-x+1=

x³-x²+x+x²-x+1=

x³+(-x²+x²)+(x-x)+1=

x³+1