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B)1,5x-1/3xy
b)x-2xy+½x-⅓xy = 1,5x -2⅓x
c)-x²+y²-2x²-2y² = -3x² - y²
d)-x²+2x-3x+x² = -x
e)4x+4-7x-½ = -3x +3,5
f)-2ab+12a-4ab-16a = -4a - 6ab
a) 2x²-xy²-5x²+2xy² = -3x²+xy²
-3x²+xy² = -3*(1/3)² + (1/3)*9² = -1/3+27 = 26 2/3
b)-½x³y-⅔xy+½x³y-⅓xy = -xy
-xy = -1/3*9 = -3