计算（最后一题要验算）．692×52 208×40 503×23 240÷48 182÷13 568÷71
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递等式计算+=+=﹣=﹣= 1﹣=+﹣= 1﹣+．
直接写出得数．===== 1﹣=
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25×8= 8.5﹣3.7= 0.56÷0.07= 4×9.2×0.25======
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