X1,X2是方程3x2-2x-4=0两根,求|X1-X2|²3x²-2x-4=0
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![X1,X2是方程3x2-2x-4=0两根,求|X1-X2|²3x²-2x-4=0](/uploads/image/z/10458829-37-9.jpg?t=X1%2CX2%E6%98%AF%E6%96%B9%E7%A8%8B3x2-2x-4%3D0%E4%B8%A4%E6%A0%B9%2C%E6%B1%82%7CX1-X2%7C%26%23178%3B3x%26%23178%3B-2x-4%3D0)
X1,X2是方程3x2-2x-4=0两根,求|X1-X2|²3x²-2x-4=0
X1,X2是方程3x2-2x-4=0两根,求|X1-X2|²
3x²-2x-4=0
X1,X2是方程3x2-2x-4=0两根,求|X1-X2|²3x²-2x-4=0
X1,X2是方程3x2-2x-4=0两根
x1+x2=2/3,x1x2=-4/3
|X1-X2|²=(x1+x2)²-4x1x2=4/9+16/3=52/9