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Rezolvarile intregi,va rog frumos!
a) (x-1)²+(x+3)²-2(x+2)(x-2)
b) (2x+3)²-4(x+1)(x+2)
c) (x+5)²-(x+1)(x+4)-6(x+3)
d) (x+3)(x-3)-(x+2)²