一只西瓜的重量等于2千克加上半个西瓜的重量,这个西瓜重 千克.
12÷ =0.25= %= :24== (填成数)
9÷ == :8= (填小数)
20: = ÷20==0.8= %
==36÷ = (填小数)
18: =0.25= %= ÷24=.