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

Răspuns :

=x+y+z+x-y-z-x-y+z
=x-y+z

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