作业帮解方程:(x-4)[50-10x+50]=50
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/03 16:08:25
![解方程:(x-4)[50-10x+50]=50](/uploads/image/z/3940767-63-7.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%3A%28x-4%29%5B50-10x%2B50%5D%3D50)
解方程:(x-4)[50-10x+50]=50
解方程:(x-4)[50-10x+50]=50
解方程:(x-4)[50-10x+50]=50
(x-4)[50-10x+50]=50
(x-4)[100-10x]=50
(x-4)[10-x]=5
10x-x^2-40+4x=5
14x-x^2-40=5
x^2-14x+45=0
(x-5)(x-9)=0
x=5或x=9
两边除以-10
(x-4)(x-10)=-5
x²-14x+40=-5
x²-14x+45=0
(x-5)(x-9)=0
x=5,x=9
(x-4)[10-x]=5
10x-x^2-40+4x=5
14x-x^2-40=5
x^2-14x+45=0
(x-5)(x-9)=0
x=5或x=9
5,9