直接写得数:1/7÷5=?3/16÷7/21=?3/16÷8/7=?5/62÷13/5=?

问题描述:

直接写得数:1/7÷5=?3/16÷7/21=?3/16÷8/7=?5/62÷13/5=?

1/7÷5=1/(7×5)=1/35
3/16÷7/21=(3×21)/(16×7) =9/16
3/16÷8/7=(3×7)/(16×8)=21/128
5/62÷13/5=(5×5)/(62×13)=25/806

  1/35,
  63/112,
  21/128,
  1/806

1/7÷5=1/35?3/16÷7/21=63/112 3/16÷8/7=21/128 5/62÷13/5=25/806