（3×10的负三次方）×（8.2×10的负二次方）²
=3*10^(-3) * (8.2*10^(-2))^2
=3*10^(-3) * 8.2^2*10^(-2+2)
=3 * 8.2^2*10^(-3)*10^0
=201.72*10^(-3)
=2.0172*10^(-1)
或者0.20172