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Efectuti:
a)5x^2+8x^2--3x^2-2x^2+16x^2=
b)a^3+3a^3-8a^3+12a^3+(29a^3-27a^3)=
c)-7a^2+4a^2+(13^2+a^2)-(a^2)=
d)(16x^2-2x^2-10x^2)-(23x^2-4x^2)=
(^ inseamna la putere)
DAU COROANA!!!