解方程(1)x²-2x-2=0 (2)2x²-5x-7=0(1)x²-2x-2=0(2)2x²-5x-7=0
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![解方程(1)x²-2x-2=0 (2)2x²-5x-7=0(1)x²-2x-2=0(2)2x²-5x-7=0](/uploads/image/z/560923-43-3.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%881%EF%BC%89x%26%23178%3B-2x-2%3D0+%EF%BC%882%EF%BC%892x%26%23178%3B-5x-7%3D0%EF%BC%881%EF%BC%89x%26%23178%3B-2x-2%3D0%EF%BC%882%EF%BC%892x%26%23178%3B-5x-7%3D0)
解方程(1)x²-2x-2=0 (2)2x²-5x-7=0(1)x²-2x-2=0(2)2x²-5x-7=0
解方程(1)x²-2x-2=0 (2)2x²-5x-7=0
(1)x²-2x-2=0
(2)2x²-5x-7=0
解方程(1)x²-2x-2=0 (2)2x²-5x-7=0(1)x²-2x-2=0(2)2x²-5x-7=0
(1)x²-2x-2=0
x²-2x+1=3
(x-1)²=3
x=1+√3 x=1-√3
(2)2x²-5x-7=0
(2x-7)(x+1)=0
x=7/2 x=-1
(1)x²-2x-2=0
x²-2x+1=3
(x-1)²=3
x-1=±√3
x1=1+√3, x2=1-√3
(2)2x²-5x-7=0
1 1
2 -7
(x+1)(2x-7)=0
x1=-1, x2=3.5