竖式计算．270×30= 540×60= 306×28= 267×34=
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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