1与一个数的倒数之差是 ,这个数是 .
9÷______=75%=______:8==______(填小数)
=______÷______=60%=______:______=______小数.
2.5:______==1.25=25÷______=______%.
3:5==15÷______=______÷75=______(填小数)
4:10==20÷______="______" (填小数).