用竖式计算（①、②、③要验算）①324+576 ②800﹣673 ③504﹣378 ④60÷8 ⑤479×2．
+=+=﹣=﹣=﹣= 1﹣= 1﹣=+=﹣=
用你喜欢的方法计算下面各题．+﹣﹣+﹣﹣﹣（﹣）+﹣++++（﹣）﹣+﹣．
直接写得数． 1﹣=+=+= 1﹣﹣=+3=+=+=++=
计算下面各题．=========
脱式计算，能简算的要简算．﹣﹣++﹣﹣（+）
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