25^16×2^38
=5^32×2^38
=(5×2)^32×2^6
=64×10^32
=6.4×10^33
4^3*100^16=64*10^32=640000000000000000000000000000000
25^16*2^38
=25^16*4^19
=25^16*4^16*4^3
=(25*4)^16*64
=64*100^16
=64*10^32
=6.4*10^33
6.4e+33
100的16次方
不知道