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五年級奧數習湊整化簡
計算:51.2×8.1+11×9.25+537×0.19
答案與解析:
稍作處理,題中數字就能湊整化簡,
原式=51.2×8.1+11×9.25+(512+25)×0.19
=51.2×8.1+11×9.25+512×0.19+25×0.19
=51.2×8.1+51.2×1.9+11×9.25+0.25×19
=51.2×10+11×0.25+11×9+0.25×19
=512+0.25×30+99
=611+7.5
=618.5
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