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Dau puncte va rog ajutatima !!
a)2x•(-3+a)
b)0,2a•(5x+10y²)
c) (x-5)(3x²+x+1)+(x²-1)(-3x+16)


Răspuns :

a)2x(-3+a)=2x·(-3)+2x·a=-6x+2xa
b)a·[tex] \frac{1}{5} [/tex]·(5x+10y²)=[tex] \frac{a}{5}[/tex]·5x+[tex] \frac{a}{5}[/tex]·10y²=ax+2ay²
c)3·x³+x²+x-15x²-5x-5-3x³+16x²+3x-16=2x²-x-21