填上“>”“<”或“=”.(1)当x=24时,x+27 50 (2)当x=12时,5x 60 (3)当x=48时,x÷6 9.
: =1= 12 ÷10= %
4:5=24÷ 3.5: =5:7.
2:5=24: = :15== %= 成= 折.
: =1.4=70/ = %
=60%= ÷20=3: = (小数)