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b)=15ab
c)=21x+6y-20xy+15x²y²-10xy²
d)=xy-4x²y
e)=30a²b+3ab²
f)=8a+17ab+2b²+13ab-b²+a²-30ab-b²-a²-8a=0
g)=3,3a-0,7a²
h)=-5/8k²-3 1/6kl