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a fost răspuns

(2x+3)(3-x)+(1-x)(1+x)=
(2a+3)(3a+2)-(-a)+3=
(a-3)(2-a)+a(a-1)=

Răspuns :

D0rina2011
1. =6x-2x^2+9-3x+1-x^2=-3x^2+3x+10
2.=6a^2+4a+9a+6+a+3=6a^2+14a+9
3.=2a-6-a^2+3a+a^2-a=4a-6

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