列竖式计算（除不尽的用循环小数表示）42.8+85.42=150×0.28=4.2÷0.25=3.6×0.25=14.2÷11=12.48÷2.4=
计算下面各题（写出主要的计算过程）．
直接写出得数：+= ﹣= +=+= 1﹣= ﹣=+= ﹣= ++=+﹣=
直接写出得数．+= ﹣= += ﹣=+= 1﹣= ﹣= +=
脱式运算，能简便的要用简便方法计算．﹣+ +++ 1﹣﹣．
直接写出的数+= ﹣= + 880÷8= 19×5=36÷3÷2= 5×5+4= 50﹣24÷4= 300×30=88+112=
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880÷8= 19×5=
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