(x-30)[600-10(x-40)] 结果X=50 (x-30)[600-10(x-40)]=10000

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(x-30)[600-10(x-40)]结果X=50(x-30)[600-10(x-40)]=10000(x-30)[600-10(x-40)]结果X=50(x-30)[600-10(x-40)]=1

(x-30)[600-10(x-40)] 结果X=50 (x-30)[600-10(x-40)]=10000
(x-30)[600-10(x-40)] 结果X=50
(x-30)[600-10(x-40)]=10000

(x-30)[600-10(x-40)] 结果X=50 (x-30)[600-10(x-40)]=10000
(x-30)[600-10(x-40)]=10000
整理得x2-130x+4000=0
(x-50)(x-80)=0
解得x1=50,x2=80
当x=50时,600-10(x-40)=500

解 原式=(x-30)(1000-10x)=?