2x²-3x=2
解:x^2-3/2x=1
x^2-3/2x+9/16=1+9/16
(X-3/4)^2=25/16
X-3/4=+-5/4
X1=2,X2=1/2
2x²-4根号下2x+3=0
解:x^2-2根号2x+3/2=0
x^2-2根号2x+2=2-3/2
(x-根号2)^2=1/2
x-根号2=+-1/2根号2
x1=3/2根号2,x2=1/2根号2
3x²+2x=0
解:x^2+2/3x=0
x^2+2/3x+1/9=1/9
(x+1/3)^2=1/9
x+1/3=+-1/3
x1=0,x2=-2/3
1、2x²-3x=2
解:x²-3/2x=1
(x-3/2)²=25/16
X-3/2=±5/4
解得:x1=-1/2,x2=2
2、2x²-4√(2x+3)=0
解:设√(2x+3)=a,则原式=[(a²-3)/2]²-4a=0
(a²-3)²-8a=0
∵a=√(2x+3)≥0,∴(a²-3)²≥0,8a≥0.
∴a²-3=0,a=±√3,所以a=√3,x=0;8a=0,a=0,8√(2x+3)=0,2=-3/2.
3、3x²+2x=0
解:x²+2/3x=0
(x+1/3)²=1/9
X+1/3=±1/3
解得:x1=0,x2=-2/3.