Aduceti la o forma mai simpla:
A) 2x(x+3)+(x-1)^2-x(x+2)
B) -10x(x^2+x+1)+(x-1)(x+2)-(x+3)(x-3)
C)(2x+5)^3 : (2x+5)^2 + (3x+1)^2 - (3x-1)^2
D) 15x(2x-3)-(5x)^2 : (-5x) + (x+1)^3 : (x+1)^2

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