10个0.625相乘以9个8相乘以8个2相乘怎么算

(0.625*2*8)=1
1*1*1*1*1*1*1*1=1
1*0.625*0.625*8=3.125

0.625=625/1000=8/5
(8/5)^10*8^9*2^8
=(2^3)^10*(2^3)^9*2^8*5^(-10)
=2^30*2^27*2^8*5^(-10)
=2^(30+27+8)*5^(-10)
=2^65*5^(-10)

原式=5/8×5/8×5/8×5/8×5/8×5/8×5/8×5/8×5/8×8×8×8×8×8×8×8×8×8×(2×2×2)×2×2×2×2×2
＝(5/8×8 )(5/8×8 )(5/8×8 )(5/8×8 )(5/8×8 )(5/8×8)(5/8×8 )(5/8×8 )(5/8×8 )(5/8×2×2×2 )×2×2×2×2×2

=5×5×5×5×5×5×5×5×5×5×2×2×2×2×2
＝5×5×5×5×5×（5×2）×（5×2）×（5×2）×（5×2）×（5×2）
＝3125×100000
＝312500000

7200 0.625 =5/8 原式=10*5/8*9*8*8*2=10*(9*(2*(8*8*5/8)=10*(9*(2*40)=10*9*80=7200

10*0.625*9*8*8*2
=10*(5/8)*9*8*8*2
=10*5*9*8*2
=10*10*9*8
=7200