0.25的倒数是 ,的倒数是 .最小质数和最小合数的积的倒数是 .
=40: = ÷40= %= (填小数)
=12: =1.2= ÷20= %
= (填小数)= 折.
÷10=0.25=1: == %.
= ÷20=12: = %.