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b) 5y³-3/2y³+13/2y³=5y³+5y³=10y³=10*3³=270
c) 56x²-4y-32x²-6y=24y²-10y=24*9-10*3=216-30=186
d) -8y²+5y=-8*3²+5*3=-72+15=-57
e) x³-2y²+2=(-1)³-2*3²+2=-1-18+2=-17
f) -3x²+19xy=-3*1²+19*1*(-3)=-3-57=-60
g) 15y²-7x²y=15*3²-7*(-1)²*3=135-21=114
h) 6x²y²-9xy=6*(-1)²-9*(-1)*3=54+27=81