（3x+1）（2X+3)-2X*X-(X+1)(X+1)-(X+2)(X+2)-(2X-1)(2X-1)=1 求解。写过程，谢谢

显示全部楼层 · 2011-11-26 23:16:29

（3x+1）（2X+3)-2X*X-(X+1)(X+1)-(X+2)(X+2)-(2X-1)(2X-1)=1（6x2+11x+3）-2x2-（x2+2x+1）-（x2+4x+4）-(4x2-4x+1)=1（6x2-2x2-x2-x2-4x2）+（11x-2x-4x+4x）+3-1-4-1-1=0
-2x2+9x-4=0
2x2-9x+4=0 (2x-1)(x-4)=0所以x=1/2或x=4...

千问 · 2011-11-26 23:16:29

（3x+1）（2X+3)-2X*X-(X+1)(X+1)-(X+2)(X+2)-(2X-1)(2X-1)=1 （2x+1+x）（2X+1+2)-2X^2-(X+1)^2-(X+2)^2-(2X-1)^2=1 （2x+1)^2+2(2x+1)+x(2x+1)+2x-2X^2-(X+1)^2-(X+2)^2-(2X-1)^2=1 （2x+1)^2+(...

千问 · 2011-11-26 23:16:29

(3x+1)(2X+3)-2X*X-(X+1)(X+1)-(X+2)(X+2)-(2X-1)(2X-1)=1(6x2+11x+3) - 2x2 - (x2+2x+1) -(x2+4x+4) - (4x2-4x+1)=16x2+11x+3 - 2x2 - x2 -2x -1...

千问 · 2011-11-26 23:16:29

（3x+1）(2x+3)=6x*x+11x+3 -2x*x
=4x*x+11x+3-(x+1)(x-1)
=4x*x+11x+3-(x*x-1)=3x*x+11x+4-(x+2)(x+2)
=3x*x+11x+4-(x*x+4x+4)=2x*x-7x-(4x*x-4x+1)=-2x*x-3...