当分数的分子和分母都是合数时,这个分数一定不是最简分数. .
3÷ ==0.375= :24=24: .
=2.5:( )=125%=20÷( )=.
5: ==0.25= %
2.5÷ ==15: = %= (小数)
÷8==0.375=9÷ =; 填质数:21= + ; = × .