x²-x-2=0 x²-8x+12=0 x²+2=3x x²+4x=21
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x²-x-2=0 x²-8x+12=0 x²+2=3x x²+4x=21
![x²-x-2=0 x²-8x+12=0 x²+2=3x x²+4x=21](/uploads/image/z/17594496-0-6.jpg?t=x%26%23178%3B-x-2%3D0+x%26%23178%3B-8x%2B12%3D0+x%26%23178%3B%2B2%3D3x+x%26%23178%3B%2B4x%3D21)
x²-x-2=0
(x+1)(x-2)=0
x=2 或x= -1
x²-8x+12=0
(x-2)(x-6)=0
x=2或 x=6
x²+2=3x
x²-3x+2=0
(x-1)(x-2)=0
x=1或x=2
x²+4x=21
x²+4x-21=0
(x+7)(x-3)=0
x=3或x=-7
(x+1)(x-2)=0
x=2 或x= -1
x²-8x+12=0
(x-2)(x-6)=0
x=2或 x=6
x²+2=3x
x²-3x+2=0
(x-1)(x-2)=0
x=1或x=2
x²+4x=21
x²+4x-21=0
(x+7)(x-3)=0
x=3或x=-7
已知f(x)={x/2,x>=0 -x²+3x,x=0
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
解方程 x(x+1)(x²-2x-4)=0 x³-2x+1=0 x的4次方+8x³+14x
解方程:(x²+x)(x²+x-3)-3(x²+x)+8=0
已知f(x)={x²-3x+4(x>0),{1-x(x
解一元二次方程 3x²=10x+83x²-10x+3=0(x+8)(x+1)=-12(x+1)(2x
已知函数f(x)=x²+x+1,x≥0;2x+1,x
f(x)=x²+3x|x-2|
解方程(x²+3x+2)(x²-2x-1)(x²-7x+12)+24=0
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
2x²+4x+x=0,求x²+2x的算术平方根
解方程(x²-3x)/(x²-1)+(2x-1)/(x-1)=0