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2(x+0,5)^2 -3(x-0,5)^2=


Răspuns :

2(x+1/2)²-3(x-1/2)²=2(x²+2x+1/4)-3(x²-x+1/4)=
2x²+4x+1/2-3x²+3x-3/4=
-x²+7x-1/4=-x²+7x-0.25