625乘以625乘以625乘以8乘以8乘以8乘以8乘以2乘以2乘以2乘以2乘以2
=（625*8)(625*8)(625*8)*8*2*2*2*2*2
=5000*5000*5000*8*2*2*2*2*2
=10000*10000*10000*8*8*8
=512000000000000