计算(-1/2x^Y).(-3xy^2)= (4*10^6)*(8*10^3)=
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计算(-1/2x^Y).(-3xy^2)= (4*10^6)*(8*10^3)=
计算(-1/2x^Y).(-3xy^2)= (4*10^6)*(8*10^3)=
计算(-1/2x^Y).(-3xy^2)= (4*10^6)*(8*10^3)=
(-1/2x^Y).(-3xy^2)
=(3/2)x³y³
(4*10^6)*(8*10^3)
=32×10^9
=3.2×10^10
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