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b) 3(-x)(-a)=3xa
c) zy × ½y=1/2zy²
d) 2cd×(-9)×d=-18cd²
e) ¼abb×(-2a)=-1/2a²b²
f) ½ a²×4×(-a)×(-5)==10a³
g) 3x²y×(-⅙xy)=-1/2x³y²
h) -3(-x)(-x)(-y)=3x²y
i) 0,2tsts²×(-15)=-3t²s³