1)20a^8*(9a)^2=20a^8*81*a^2=1620*a^10
2)(0.2x^7*y^8)^3*6*x^2*y^2=0.008*x^21*y^24*6*x^2*y^2=0.048*x^23*y^26
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1)20a^8*(9a)^2=20a^8*81*a^2=1620*a^10
2)(0.2x^7*y^8)^3*6*x^2*y^2=0.008*x^21*y^24*6*x^2*y^2=0.048*x^23*y^26