用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1 用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/11 22:22:52
![用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1 用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1](/uploads/image/z/5344301-29-1.jpg?t=%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A2y%26%23178%3B%2B8y%2B7%EF%BC%9D0+-1%2F2x%26%23178%3B-3x%3D1+%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A2y%26%23178%3B%2B8y%2B7%EF%BC%9D0+-1%2F2x%26%23178%3B-3x%3D1)
x){>egv><@2TS64ֶ6gQDPP|6IEL~;:2a0TFfT/c{h㣎YFF[]#VB*D-bږ`Q
mce5ˠ\[]c(W 1 pb
用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1 用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1
用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1
用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1
用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1 用配方法解方程:2y²+8y+7=0 -1/2x²-3x=1
2y²+8y+7=0
2y²+8y+8=1
2(y+2)^2=1
y+2=±√2/2
y=-2±√2/2
-1/2x²-3x=1
x²+6x=-2
x²+6x+9=-2+9
(x+3)^2=7
x+3=±√7
x=-3±√7