0.000000000084x0.00000000025,等于多少?
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0.000000000084 x 0.00000000025
=[84x10^(-12)] x [25x10^(-11)]
=84x25x10^(-12-11)
=84x5x5x10^(-33)
=420x5x10^(-33)
=2100x10^(-33)
=21x10^2 x10^(-33)
=21x10^(2-33)
=21x10^(-31)
