简便运算:27×46÷79÷46×79÷27 19961997×19971996-19961996×19971997 1994﹢199.4﹢19.94﹢1.9949.1﹢9.2﹢9.3﹢9.4﹢……﹢10.7﹢10.8﹢10.9 89﹢899﹢8999﹢89999﹢899999 急要

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