十万火急!解方程:[500-10(x-50)](x-40)=8000

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十万火急!解方程:[500-10(x-50)](x-40)=8000十万火急!解方程:[500-10(x-50)](x-40)=8000十万火急!解方程:[500-10(x-50)](x-40)=80

十万火急!解方程:[500-10(x-50)](x-40)=8000
十万火急!解方程:[500-10(x-50)](x-40)=8000

十万火急!解方程:[500-10(x-50)](x-40)=8000
[500-10(x-50)](x-40)=8000
(500-10x+500)(x-40)=8000
(1000-10x)(x-40)=8000
1400x-10x²-40000=8000
-10x²+1400x-48000=0
-x²+140x-4800=0
x²-140x+4800=0
(x-60)(x-80)=0
x=60 或 x=80