2x²-8=0 (x-2)²-x+2=0 (x-3)²+2x(x-3)=0 (x-2)²=2x-4 (2x-1)²=x²-4用一元二次方程的因式分解法解
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![2x²-8=0 (x-2)²-x+2=0 (x-3)²+2x(x-3)=0 (x-2)²=2x-4 (2x-1)²=x²-4用一元二次方程的因式分解法解](/uploads/image/z/2555740-28-0.jpg?t=2x%26%23178%3B-8%3D0+%EF%BC%88x-2%EF%BC%89%26%23178%3B-x%2B2%3D0+%28x-3%29%26%23178%3B%2B2x%28x-3%29%3D0+%28x-2%29%26%23178%3B%3D2x-4+%282x-1%29%26%23178%3B%3Dx%26%23178%3B-4%E7%94%A8%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%9A%84%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E6%B3%95%E8%A7%A3)
2x²-8=0 (x-2)²-x+2=0 (x-3)²+2x(x-3)=0 (x-2)²=2x-4 (2x-1)²=x²-4用一元二次方程的因式分解法解
2x²-8=0 (x-2)²-x+2=0 (x-3)²+2x(x-3)=0 (x-2)²=2x-4 (2x-1)²=x²-4
用一元二次方程的因式分解法解
2x²-8=0 (x-2)²-x+2=0 (x-3)²+2x(x-3)=0 (x-2)²=2x-4 (2x-1)²=x²-4用一元二次方程的因式分解法解
1、2(X+2)(X-2)=0,
X+2=0或X-2=0,
X1=-2,X2=2.
2、(X-2)^2-(X-2)=0
(X-2)(X-3)=0
X1=2,X2=3,
3、(X-3)^2+2X(X-3)=.0
(X-3)(X-3+2X)=0
X-3=0或3X-3=0
X1=3,X2=1,
4、(X-2)^2-2(X-2)=0
(X-2)(X-4)=0
X1=2,X2=4.
5、4X^2-4X+1-X^2+4=0
3X^2-4X+5=0
Δ=16-4×3×5