已知x的平方加x减2分之2x减3等于x减1分之a-搜答案-智慧作业帮

1楼最后算错了引用一下：1/(x+1)-1/(x²-1)÷(x+1)/(x²-2x+1)=1/(x+1)-1/(x+1)(x-1)×(x-1)(x-1)/(x+1)=1/(x+1)

已知x的平方减4x加1等于0,x-4+1/x=0x+1/x=4x^2+2+1/x^2=16x^2+1/x^2=14x的4次方加x的2次方+1分之x²的值=1/(x^2+1+1/x^2)=1/

题目可能为：已知(x-2)的平方分之x+3=x-2分之A+(x-2)的平方分之B,求A,B的值

原式=(x^2-1)/x÷(x^2+x)/x^2=(x-1)(x+1)/x*x^2/x(x+1)=x-1当x=2时,原式=2-1=1

x-3=1/xx（x-3）=1x²-3x+2=x（x-3）+2=1+2=3

已知x的平方减5x加1等于0,x-5+1/x=0x+1/x=5x^2+2+1/x^2=25x^2+1/x^2=23x^2-2+1/x^2=23-2(x-1/x)^2=21x-1/x=±√21再问：^和

有歧义啊啊!再问：？再答：你这说的太不清楚了，建议写下来拍照再问：再问：再问：再答：第一个是x+1/x+2再答：第二个是1/a+2再答：第三个太麻烦再问：再问：对不对？再答：对再答：分呢！

x^2-2x+y^2+6y+10=0x^2-2x+1+y^2+6y+9=0(x-1)^2+(y+3)^2=0x-1=0,y+3=0x=1,y=-3(x-y)/(x+y)=4/(-2)=-2

x²+y²+4x-6y+13=0(x²+4x+4)+(y²-6y+9)=0(x+2)²+(y-3)²=0x+2=0y-3=0x=-2y=3当

x^2-3x+1=0x+1/x=(x^2+1)/x=(x^2-3x+1+3x)/x=(0+3x)/x=3x^2+1/x^2=(x+1/x)^2-2=3^2-2=7

16/65

∵x^2－x－1＝0,∴x^2＝x＋1、且x－1－1/x＝0,∴x－1/x＝1,∴（x－1/x）^2＝1,∴x^2－2＋1/x^2＝1,∴x^2＋1/x^2＝3,∴x^4＋1＝3x^2,∴x^4＝3x

x²+y²-4x-2y+5=0x²-4x+4+y²-2y+1=0(x-2)²+(y-1)²=0x-2=0x=2y-1=0y=1√(x+y)/

解题思路：将已知等式两边平方，由完全平方公式求得x²+1/x²的值解题过程：

(x+1)/x²-2x²/(x+1)=1令t=(x+1)/x²,那么x²/(x+1)=1/t所以原方程变为：t-2/t=1t²-t-2=0,(t+1)

原式=[(x+1)/(x-1)]-[(x²-2x)/(x²-1)]×[(x²+2x+1)/(x²-x-2)]=[(x+1)/(x-1)]-{x(x-2)/[(x

[(x^2-2x+1)/x^2]÷(x^2-1)*[(x^2+x)/(x^2-3x+2)]=[(x-1)^2/x^2]÷[(x+1)(x-1)]*[x(x+1)/(x-1)(x-2)]=(x-1)^2

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