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Irraphael
a fost răspuns

Desfaceti parantezele si reduceti termenii asemenea:
a) (x+y+z)–(–x+y+z)+(–x–y+z)=
b) 2x–(–3x-1+2x²)+3x²+(-2x+1+6x)+2x

Răspuns :

a) x+y+z+x-y-z-x+y+z=x+y+z

b) 2x+3x+x-2x²+3x²-2x+1+6x+2x = x²+12x+1

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