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zy×1/2y= 1½yz
2cd×(-9)×d= -18cd²
3(-x)(-a)= 3ax
b) 3ax
c) 1/2×y²z
d) -18cd²×²
e) -1/2a²b²×
f) 10a²×³
g) -1/2x³y²
h) 3x²y
i) -3s³t²×