按照给定的运算顺序添括号.减→除→加 6000÷60﹣30+60.
%= ÷30== (填小数)= 折.
= ÷ =0.8= %= :10.
=65%= ÷20=26: = (小数)
: == ÷6=6÷ .
= : ==6÷ = %