数学··

显示全部楼层 · 2009-4-14 19:11:07

(1)9(2x-1)^2-8=0 (2)x^2+2根号2 乘X-4=0
(3)3y^2+1=2根号3 乘y (4)1/3(x-1)^2=1/2(x-1)
(5)x^2+2x=2 (6)x^2-x-2=0 （7）x^2+x-1=0 4x^2+8x+1=0
（8)(2t+1)^2+3(2t+1)+2=0
(9)4x^2-4x-3=0

千问 · 2009-4-14 19:11:07

1.9(2x-1)^2=8 (2x-1)^2=8/9 2x-1=正负(2根号2/3) x=1/2加减（根号2/3) 2.x^2+(2根号2)x+2=6 (x+根号2)^2=6 x=正负根号6-根号2 3.3y^2+1-（2根号3 乘y）=0 (根号3y-1)^2=0 y=根号3/3 4.1/3(x-1)=1/2 x=5/2 5.x^2+2x-2=0 x^2+2x+1-3=0 (x+1)^2=3 x=正负（根号3）-1 7.x^2+x+1/4-5/4=0 (x+1/2)^2=5/4 x=正负（根号5/4）-1/2 8.(2t+1)^2+3(2t+1)+9/4-9/4+2=0 ...

千问 · 2009-4-14 19:11:07

1.9(2x-1)^2=8 (2x-1)^2=8/9 2x-1=正负(2根号2/3) x=1/2加减（根号2/3) 2.x^2+(2根号2)x+2=6 (x+根号2)^2=6 x=正负根号6-根号2 3.3y^2+1-（2根号3 乘y）=0 (根号3y-1)^2=0 y=根号3/3 4.1/3(x-1)=1/2 ...

千问 · 2009-4-14 19:11:07

x=正负1+1/2...