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b) (1 1/2)x-(2 1/3)xy
c) -3x^2-y^2
d) -2x^2-x
e) -3x+3 1/2
f) -4a-6ab
b)x-2xy+½x-⅓xy=½x-2⅓xy
c)-x²+y²-2x²-2y²=-3x²-y²
d)-x²+2x-3x-x²=-2x²-x
e)4x+4-7x-½=-3x+3½
f)-2ab+12a-4ab-16a =-6ab-4a
b)x-2xy+½x-⅓xy=1,5x-2⅓xy
c)-x²+y²-2x²-2y²=-3x²-y²
d)-x²+2x-3x-x²=-2x²-x
e)4x+4-7x-½=-3x+3,5
f)-2ab+12a-4ab-16a=-4a-6ab