4x2-4x+1=x2+6x+9
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4x2-4x+1=x2+6x+9
4x2-4x+1=x2+6x+9
4x2-4x+1=x2+6x+9
1.
4x²-4x+1=x²+6x+9
(2x-1)²=(x+3)²
(2x-1)²-(x+3)²=0
[(2x-1)+(x+3)][(2x-1)-(x+3)]=0
(3x+2)(x-4)=0
x=-2/3或x=4
2.
令x=a²+b²,带入原式,得
x²-2x-8=0
(x-4)(x+2)=0
x=4或x=-2
易知a²+b²≥0
∴a²+b²=4
4x2-4x+1=x2+6x+9
4x²-4x+1-x²-6x-9=0
3x²-10x-8=0
(x-4)(3x+2)=0
x1=4, x2=-2/3
4x2-4x+1=x2+6x+9
解方程4x2-4x+1=x2+6x+9 7x2-√6x-5=0
1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21x2是x的平方
7/x2+x+1/x2-x=6/x2-1
计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2
3/x2 -3x+2-1/x-2=1/x2 -x+4/x2 -2x
解方程x-4/x2+x-2=1/(x-1)+(x-6)/(x2-4)
x2+2x+2/(x+1)=(x2+4x+6)/(x+2)-1
x2/x2+x+1=1/4,求x2/x4+x2+1的值如题
已知x2-4x+1=0,求x2/(x2)2-3x2+1
x2-4x+1=0,则x+1/x=?x2+1/x2=?
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708
约分 1-x2/x2-3x-4
(1-x2)(x2-4x+5)
不等式(x2-4x-5)(x2+1)
化简:根号(x2+6x+9)+根号(x2-2x+1)-根号(x2-4x+4)
x2-6x+9/x2-4 x2-4x/x2-8x+16 2是平方 /是分数线
(x2+4x)/(x-1)