(49999(×2)-49999×9999-400×2999900)÷100000(简便计算)

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(49999(×2)-49999×9999-400×2999900)÷100000(简便计算)

(49999(×2)-49999×9999-400×2999900)÷100000(简便计算)
(49999(×2)-49999×9999-400×2999900)÷100000(简便计算)

(49999(×2)-49999×9999-400×2999900)÷100000(简便计算)
原式=(49999(49999-9999)-400×2999900)÷100000
=(49999*40000-40000×29999)÷100000
=20000*40000÷100000
=8000