用竖式计算，要求验算的要验算．208+698=验算：700﹣l85=验算：567×9=250×8=68÷8=42÷7=
递等式计算+=+=﹣=﹣= 1﹣=+﹣= 1﹣+．
直接写出得数．===== 1﹣=
．
25×8= 8.5﹣3.7= 0.56÷0.07= 4×9.2×0.25======
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