= = == = == =
直接写出得数.= = 1﹣= +0.625== = 3﹣= +0.75=
口算:+= 1.52= ﹣= 1.8÷2.7=﹣= += 4+= 3﹣=﹣= ﹣= ﹣﹣= ++=
(1)+= (2)﹣= .
直接写出得数.= = = == = = =