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2ab-2a^(2)
B)
ab- 3ab^(2)
C)
2X^(2)Y + 6XY^(2) - 2X^(2)Y = 6XY^(2)
D)
2X+4X^(2)-4XY
B) (a-3ab) b = ab-3ab²
C) 2xy(x+3y-x) = 2x²y+6xy² -2x²y = 6xy²
D) x2(1+2x-y2) = x²+2x3- x²y² el segundo termino es 2x al cubo