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b) 3 * (-x) * (-a) = 3 ax
c) zy * 1/2y = 1/2 y²z
d) 2 cd * (-9) * d = -18 cd²
e) 1/4 * abb * (-2a) = -1/2 a²b²
f) 1/2 a² * 4 * (-a) * (-5) = 10 a³
g) 3 x²y * (-1/6 xy) = -3/6 x³y² = - 1/2 x³y²
h) -3 * (-x) * (-x) * (-y) = 3 x²y