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
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![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)
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