简算:3.14×99 19.25﹣0.47﹣8.53 1.25×0.03×8 720÷45.
3÷8═= ÷24= %= :56.
3:4= :8=9: == %
3÷ == :12=七成五= %
÷10==9: == :40.
18: = :20== ÷40=1.2.