x的平方 x-1的解-搜答案-搜搜做题作业网

(2x-3)(x-三分之一)=3x的平方-(x+1)(x-1)2x²-3x-2/3x+1=3x²-x²+111/3x=0x=0

x(x²-2x+1)-3x(x²-4x+1)=x³-2x²+x-3x³+12x²-3x=-2x³+10x²-2x=-2x

设X²+3X为Y;Y-8=20/Y;Y²-8Y-20=0;(Y-10)(Y+2)=0;Y=10或-2;所以：1：X²+3X=10,X=2或-5;2:X²+3X=

(xx-8x+16)/(xx-4x+4)+[1+2/(x-2)][1+2/(x-2)]=2x/(x-2)(x-4)^2/(x-2)^2+[1+2/(x-2)]^2=2x/(x-2)[1-2/(x-2)

(X-3)平方-(X+3)*(X-3)=(X+1)*(X+2)-(X-1)*(X+4)x^2-6x+9-x^2+9=x^2+3x+2-x^2-3x+4-6x+18=66x=18-66x=12x=2

原式=-2x³+6x²-3x³-3x²=-5x³+3x²

两边乘以(x+2)(x-2)得-x²=(x-2)-(x+2)(x-2)-x²=x-2-x²+4x=-2检验：x=-2是增根∴方程无解再问：��ʽa-3��֮

x(x+3)-x(1-2x)=1+3x²x²+3x-x+2x²=1+3x²x²+3x-x+2x²-3x²=12x=1x=2分之1

原式=(x+1)²(x-1)²-4(x+1)²=(x+1)²[(x-1)²-4]=(x+1)²(x-1+2)(x-1-2)=(x+1)&su

x(x-1)(x-2)³(x+1)(x-1)(x-1)(x²+x+1)/[(3-4x)(x²+x+2)]>0x(x-1)³(x-2)³(x+1)(x&

根据解题过程,1+m≠0,m≠-1.(1+m)X²+3X=0X[(1+m)X+3]=0X=0或(1+m)X+3=0X1=0,X2=-3/(1+m).

x【x+1】的平方-x【x的平方-3】-2【x+1】【x-1】=20x³+2x²+x-x³+3x-2x²+2=204x+2=204x=18x=4.5

再答：再答：

937***@qq.com：5（x-3）（x+5）＝x²+（2x-1）²5（x²+2x-15）＝x²+（4x²-4x+1）5x²+10x-7

(x²-6x+9)/(x+1)÷(x²-9)/(x²+x)=[(x-3)²/(x+1)]×[x(x+1)/(x+3)(x-3)]=x(x-3)/(x+3)x的平

①x的平方=4xx(x-4)=0x1=0,x2=4②(2x+1)的平方=(3-x)的平方2x+1=3-x或2x+1=x-3x1=2/3x2=-4

（7+x）的平方+x的平方=（2x）的平方(7+x)^2+x^2=4x^249+14x+2x^2=4x^22x^2-14x-49=0x^2-7x-24.5=0（x-3.5)^2=36.75x-3.5=

9+6+1/9-3+1=13又9分之1

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

x的平方-1分之x除以x的平方分之x的平方=x²-(x/1)/(x²/x²）=x²-(x)/1=x²-x