发布网友
共1个回答
热心网友
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)