2x-1=-2x² 用公式法怎么做?
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/28 07:43:54
2x-1=-2x² 用公式法怎么做?
![2x-1=-2x² 用公式法怎么做?](/uploads/image/z/5423365-37-5.jpg?t=2x-1%3D-2x%26%23178%3B+%E7%94%A8%E5%85%AC%E5%BC%8F%E6%B3%95%E6%80%8E%E4%B9%88%E5%81%9A%3F)
2x +2×=1
2(x^2+x)=1
2(x^2+1/4x-1/4x+x)=1
2(x-1/4)^2=1
(×-1/4)^2=1/2
x-1/4=+-√2/2
x=√2/2+1/4或-√2/2+1/4
2(x^2+x)=1
2(x^2+1/4x-1/4x+x)=1
2(x-1/4)^2=1
(×-1/4)^2=1/2
x-1/4=+-√2/2
x=√2/2+1/4或-√2/2+1/4