十万火急!解方程:[500-10(x-50)](x-40)=8000
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:综合作业 时间:2024/06/23 18:49:02
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](/uploads/image/z/15643514-2-4.jpg?t=%E5%8D%81%E4%B8%87%E7%81%AB%E6%80%A5%21%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A%5B500-10%EF%BC%88x-50%29%5D%28x-40%29%3D8000)
[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
(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