初中数学

显示全部楼层 · 2012-6-10 20:40:16

1)X2+X=0
x(x+1)=0
x=0或x+1=0
x=0或x=-12)X2-2√3X=0
x(X-2√3)=0
x=0或X-2√3=0
x=0或X=2√33)3X2-6X=-3
3X2-6X+3=0
X2-2X+1=0
(X-1)2=0
x1=x2=14) 4X2-121=0
...

千问 · 2012-6-10 20:40:16

1.x(x+1)=02.x(x-2根号3）=03.x^2-2x+1=0;(x-1)^2=04.(2x+11)(2x-11)=05.6x^2+3x=4x+2,6x^2-x-2=0;(2x+1)(3x-2)=06.(x+3)(x+9)=0...

千问 · 2012-6-10 20:40:16

（1）X2+X=0 x(x+1)=0,x=0,x=-1（2）X2-2√3X=0 x(x-2√3)=0,x=0,x=2√3（3）3X2-6X=-3 3X2-6X+3 =03(x-1)2=0x=1（4）4X2-121=0(2x-√121)(2x+√121)=0...

千问 · 2012-6-10 20:40:16

（1）x（x+1)=0
X1=0X2=-1(2)X(X-2√3)=0X1=0
X2=2√3(3)X2-2X+1=0(X-1)2=0X1=X2=1...

千问 · 2012-6-10 20:40:16

x(x+1)=0x1=0 x2=-1x(x-2√3)=0 x1=0x2=2√33x2-6x+3=0x2-2x+1=0 (x-1)=0x1=x2=1(2x+11)(2x-11)=0 x1=-5.5x2=5.53X（2X+1）=2(2x+1)
(3x-2)(2x+1)=0x1=1.5x2=-0...