3x²-2x-1=0解方程-搜答案-大师作文网

两边乘以(x+1)(x-1)得x²-3x+(2x-1)(x+1)=0x²-3x+2x²+x-1=03x²-2x-1=0(3x+1)(x-1)=0∴x=-1/3x

（x+1)/x²-3=1/xx+1-3x²=x3x²=1x²=1/3x=±(√3)/3再问：1/x^2-1+2/x+1=3/x-1再答：��

两边乘(x+3)(x-2)6x+18=x²-2x-x²-x+66x+18=-3x+69x=-12x=-4/3经检验,x=-4/3是方程的解

4/(x-2)+(x-1)/[(x-2)(x-3)]-2/(x-3)=0[4(x-3)+(x-1)-2(x-2)]/[(x-2)(x-3)]=03(x-3)/[(x-2)(x-3)]=0不知道解了~~

x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1

2x(x-1)-x(3x+2)=-x(x+2)-122x^2-2x-3x^2-2x=-x^2-2x-122x^2-3x^2+x^2-2x-2x+2x=-12-2x+12=0-2(x-6)=0x-6=0

方程两边同时乘以x²-1:(3x²+9x+7)(x-1)-(2x²+4x-3)(x+1)-(x³+x+1)=03x^3+9x^2+7x-3x^2-9x-7-(2

(x+1)(x+2)(x^2-2x-1)(x-3)(x-4)+24=0(x+1)(x-3)(x+2)(x-4)(x^2-2x-1)+24=0(x^2-2x-3)(x^2-2x-8)(x^2-2x-1)

解方程：2x*x+3x-3=0

2x*x+3x-3=02x*x+3x=3x*x+3x/2=3/2(x+3/4)^2=3/2+9/16(x+3/4)^2=33/16x+3/4=±√33/4x=(-3±√33)/4如还不明白,请继续追问

2/x^2+x+3/x^2-x-4/x^2-1=0(2/x^2+3/x^2-4/x^2)+x-x-1=01/x^2-1=01/x^2=1x^2=1x=1或-1

x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)

(x^2+x)(x^2+x-3)-3(x^2+x)+8=0（x^2+x)^2-6(x^2+x)+8=0(x^2+x-4)(x^2+x-2)=0x^2+x-4=0x^2+x-2=0(x+1/2)^2=1

解方程1/x=x/(3x-2)

转换一下x^2=3X-2x≠0X≠2/3X^2-3X+2=0(x-2)(X-1)=0x=2X=1

(1-3x)2+(2x-1)(1+2x)-5x=01-6x+9x²+4x²-1-5x=013x²-11x=0x(13x-11)=0x=0,x=11/13

(x+1)(x-3)=2x+5x²-2x-3=2x+5x²-4x=8x²-4x+4=8+4(x-2)²=12x-2=±2√3x=2-2√3,x=2+2√3

x²+3x-1=x-2x^2+2x+1=0(x+1)^2=0x=-1

你好,我认真解答了这道题,看最终没有实数解啊.我希望能帮到你

设X为正数则：（X+2）-（3X+5）=1+X解得X=-4/3设X为负数则：（-X+2）-（-3X+5）=1+（-X）解得X=4/3

（1）原方程即为：(x2-1)/(-2x)+(x+1)/(2x-1)=0即为：(x2-1)/(2x)=(x+1)/(2x-1)即：(x+1)(x-1)(2x-1)=(2x)(x+1)双方除以（x+1）