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Desfaceti parantezele
a)(8b+12)-(2-5b)=
b)-0a+a(2,5a+5)=
c)(2x-3)totul a 3=


Răspuns :

a) 8b+12-2+5b=13b+10
b) 0a+2,5a^2+5a=5a+2,5a^2
c) 8x^3-36x^2+27x-27