AJUTOOOR VA ROGGGG. AM NEVOIE
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Răspuns:
4x²-4x+1+(-2x+4)×(x+1)-(x²+2x+1)
=4x²-4x+1x-2x²-2x+4x+4-x²-2x-1
=x²-4x+4
Sper ca e ok!