我不要分,很简单啊~~(49999X49999-49999X9999-400X2999900)/100000先化,然后(49999X40000-400X2999900)/100000看得懂吧,(49999X40000-40000X29999)/100000,(40000X20000)/100000,800000000/100000=8000
(49999²-49999×9999-400×2999900)÷100000这道题怎么做
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