1.x²+(2根号5)*5+5=02.x²+12x=93.-x²+4x-3=04.-x²+5x+6=0
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![1.x²+(2根号5)*5+5=02.x²+12x=93.-x²+4x-3=04.-x²+5x+6=0](/uploads/image/z/2516349-21-9.jpg?t=1.x%26%23178%3B%2B%EF%BC%882%E6%A0%B9%E5%8F%B75%EF%BC%89%2A5%2B5%3D02.x%26%23178%3B%2B12x%3D93.-x%26%23178%3B%2B4x-3%3D04.-x%26%23178%3B%2B5x%2B6%3D0)
1.x²+(2根号5)*5+5=02.x²+12x=93.-x²+4x-3=04.-x²+5x+6=0
1.x²+(2根号5)*5+5=0
2.x²+12x=9
3.-x²+4x-3=0
4.-x²+5x+6=0
1.x²+(2根号5)*5+5=02.x²+12x=93.-x²+4x-3=04.-x²+5x+6=0
x²+(2根号5)*5+5=0, 是否为x²+(2根号5)*x+5=0?
1.x²+2√5*x+5=0(x+√5)²=0
x=-√5
2.x²+12x=9x²+12x-9=0
b²-4ac=12²-4*1*(-9)=180
x=(-b±√(b²-4ac))/4a
=(-12±6√5)/4
=(-6±3√5)/2
3.-x²+4x-3=0x²-4x+3=0
(x-1)(x-3)=0
x=1 x=3
4.-x²+5x+6=0x²-5x-6=0
(x-6)(x+1)=0
x=6 x=-1