比较大小:﹣7 ﹣5 0 ﹣24.
27÷ == :2== (填小数)
== ÷12= (小数)
=9: = :20= ÷ a:4=3a: = :4+2.
=4÷ = (填小数)= %
6÷ == :12=七成五= %