x-0.8x=1.2解方程 解方程:2(x-2)+(x-1)^2=(x+1)(x-1)+x
解方程:2(x-2)+(x-1)^2=(x+1)(x-1)+x
解方程:2(x-2)+(x-1)^2=(x+1)(x-1)+x
2(x-2)+(x-1)^2=(x+1)(x-1)+x
2x-4+x²-2x+1=x²-1+x
-3=x-1
x=-2
解方程 2(x-2)+x^2=(x+1)(x-1)+x
解
2x-4+x²=x²-1+x
2x-x=4-1
x=3
(x-1)(x+1)-2x=(x 2)(x-1)解方程
解:
(x-1)(x+1)-2x=(x+2)(x-1)
x²-1-2x=x²+x-2
3x=1
x=⅓
解方程(x-1)/(x-2)-(x-2)/(x+1)=1+(2x-7)/(x^2-x-2)
解:原式两边同×(x-2)(x+1)得:
(x-1)(x+1)-(x-2)(x-2)=(x-2)(x+1)+(2x-7)
x²-1-(x²-4x+4)=x²-x-2+2x-7
x²-1-x²+4x-4-x²-x+9=0
-x²+3x+4=0
x²-3x-4=0
(x-4)(x+1)=0
x1=4 x2=-1
把x1=4代入原方程经检验为原方程的解,
x2=-1不是原方程的解,∴舍去
∴原方程的解为x=4
解方程:①3x(x-1)=2x②(x+1)(x-2)=4
①3x(x-1)-2x=0,
∴x(3x-3-2)=0,
∴x=0或3x-5=0,
∴x1=0,x2=
;
②x2-x-6=0,
∴(x-3)(x+2)=0,
∴x-3=0或x+2=0,
∴x1=3,x2=-2.
解方程 x-2[x-1/2(x-1)]=2/3(x+1)
x-2[x-1/2(x-1)]=2/3(x+1)
X-2[X-1/2X+1/2]=2/3X+2/3
X-2X+X-1=2/3X+2/3
2X-2X-1=2/3X+2/3
-1=2/3X+2/3
-2/3X=5/3
X= - 5/2
解方程(1)(x-1)(x-2)=2(2)(x+6)(x-1)=0
(x-1)(x-2)=2
x^2-3x+2=2
x^2-3x=0
x(x-3)=0 x=0或x=3
(x+6)(x-1)=0
x+6=0或x-1=0
x=-6或x=1

解方程:3x(x-2)+(x+1)(x-1)=4(x^2+8)
3 x(x - 2)+ (x + 1)(x - 1)= 4(x ² + 8)
解:3 x ² - 6 x + x ² - 1 = 4 x ² + 32
4 x ² - 6 x - 1 = 4 x ² + 32
4 x ² - 4 x ² - 6 x = 32 + 1
- 6 x = 33
x = 33 ÷ (- 6)
x = - 33 / 6
x = - 11 / 2
x = - 5.5
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解方程:(x+1)(x-1)=x(2x+3)-(x-2)平方
(x+1)(x-1)=x(2x+3)-(x-2)平方
X^2-1=2x^2+3x-x^2+4x-4
-1=3x+4x-4
3x+4x=-1+4
7x=3
x=3/7
解方程:(x-1)^2-(x+1)(x-1)=6
X^2—2X+1—X^2+1=6
2X=-4
X=-2