(49999*49999-49999*9999-400*2999900)/100000如何巧算

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(49999*49999-49999*9999-400*2999900)/100000如何巧算(49999*49999-49999*9999-400*2999900)/100000如何巧算(49999

(49999*49999-49999*9999-400*2999900)/100000如何巧算
(49999*49999-49999*9999-400*2999900)/100000如何巧算

(49999*49999-49999*9999-400*2999900)/100000如何巧算
原式=(49999*(49999-9999)-40000*29999)/100000
=(49999*40000-40000*29999)/100000
=(40000*20000)/100000
=8000
分给我吧 才一级啊