小数点右边第二位是百分位,计数单位是0.1. .(对的打“√”,错的打“×”)
%= ÷ =六成= +.
等于a除以b(a不等于0,b不等于0). .
6:24=24: == ÷120= %
25= = = :20.
= :40= %= 折= (小数)[填小数].