计算下面各题．56×18 33×22 76×42．
直接写出得数．+=+=++=﹣（﹣）= 3﹣=﹣=（﹣）×0= 5﹣﹣3=
用你喜欢的方法计算．+﹣+﹣ 5﹣﹣．
怎样简便怎样算．++=+++=﹣（+）=
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﹣=+=+=﹣=﹣=﹣=+=﹣= 1﹣﹣=+=
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