竖式计算并验算 （1）297+586= （2）600﹣58= （3）636﹣519=
口算．﹣=+= 2﹣=+=﹣=﹣=++= 1﹣﹣=﹣+= 5﹣﹣=
直接写得数. 7.2÷9=﹣=+=﹣+= 5﹣=﹣×0=
= ．
直接写得数．========
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﹣
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= 2﹣
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= 1﹣
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= 5﹣
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= ．
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