(1)2x^2-4x-5=0 (2)-3x²-4x+4=0 (3)3x(x-1)=2-2x (4)(x-1)(x+2)=70 (5)x(x+6(1)2x^2-4x-5=0(2)-3x²-4x+4=0(3)3x(x-1)=2-2x(4)(x-1)(x+2)=70(5)x(x+6)=7(6)(3-x)²+x²=9详细过程………………

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(1)2x^2-4x-5=0 (2)-3x²-4x+4=0 (3)3x(x-1)=2-2x (4)(x-1)(x+2)=70 (5)x(x+6(1)2x^2-4x-5=0(2)-3x²-4x+4=0(3)3x(x-1)=2-2x(4)(x-1)(x+2)=70(5)x(x+6)=7(6)(3-x)²+x²=9详细过程………………
(1)2x^2-4x-5=0 (2)-3x²-4x+4=0 (3)3x(x-1)=2-2x (4)(x-1)(x+2)=70 (5)x(x+6
(1)2x^2-4x-5=0
(2)-3x²-4x+4=0
(3)3x(x-1)=2-2x
(4)(x-1)(x+2)=70
(5)x(x+6)=7
(6)(3-x)²+x²=9
详细过程……………………………………急!

(1)2x^2-4x-5=0 (2)-3x²-4x+4=0 (3)3x(x-1)=2-2x (4)(x-1)(x+2)=70 (5)x(x+6(1)2x^2-4x-5=0(2)-3x²-4x+4=0(3)3x(x-1)=2-2x(4)(x-1)(x+2)=70(5)x(x+6)=7(6)(3-x)²+x²=9详细过程………………
(1)2x²-4x-5=0
x²-2x+1=1+5/2
(x-1)²=14/4
x-1=±√14/2
∴x=(2+√14)/,
或x=(2-√14)/2.
(2)-3x²-4x+4=0
3x²+4x-4=0
(x+2)(3x-2)=0
x=-2或x=2/3.
(3)3x(x-1)=2-2x
3x(x-1)+2(x-1)=0
(x-1)(3x+2)=0
x=1或x=-2/3.
(4)(x-1)(x+2)=70
x²+x-72=0
(x-8)(x+9)=0
x=8或x=-9.
(5)x(x+6)=7
x²+6x-7=0
(x-1)(x+7)=0
x=1或x=-7.
(6)(3-x)²+x²=9
(3-x)²-(3+x)(3-x)=0
(3-x)[(3-x)-(3+x)]=0
2x(x-3)=0
x=0或x=3.
牛B啊!我们初二才学一元二次方程,你们6年级就学了!

解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1 已知1/√(x)+√(x)=√5,求√(x/x2+x+1)+√(x/x2-x+1)的值定义域 x>0,两边平方,x+2+1/x=5,x+1/x=3,x^2-3x+1=0,x^2+x+1-4x=0,x^2+x+1=4x,x^2-x+1-2x=0.x^2-x+1=2x,√[x/(x^2+x+1)]-√[x/(x^2-x+1)]=√[x/(4x)]-√[x/2x]=√(1/4)-√(1/2) (X-3分之x-1-x分之x-4)除以x的平方+3x分之(x+3)(x-2),其中(x-1)(x-2)=0 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 1、1/2x=2/x+32、x/x+1=(2x/3x+3)+13、2/x-1=4/x²-14、5/x²+x-1/x²-x=0 一元二次方程解答!x(5x+4)=5x+44x^2-45=31x-3x^2+22x-24=0(x+8)(x+1)= -12(3x+2)(x+3)=x+14 解下列方程!就三道!解下列方程.1、x/x-2 - 1-x²/x²-5x = 2x/x-3(x/x-2 - 1-x²不是一起的!)2、5x/x²+x-6 - 5-2x/x²-x-12=7x-10/x²-6x+8(5x/x²+x-6 - 5-2x不是一起的!)3、x-4/x-5 + x-8/x-9=x-7/x- x+5/x+1-3x-3/x+5=8x+28/x^2+4X-5-2(x+5)/(x+1)-(3x-3)/(x+5)=(8x+28)/(x^2+4X-5)-2 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X 如果1+x+x^2+x^3=0,求x+x^2+X^3+x^4+x^5+x^6+x^7+x^8的值, 计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1 x(x^2-1)+2x^2 *(x+1)-3x*(2x-5)=x(3x^2-4x)-28 5x-3(2x+1)=6x-4(5-3x)求x 5x-3(2x+1)=6x-4(5-3x)求x 2(5x-4)-3(x+6)=5(x-1)-x 求x. (x-1)(x-2)=0 (2x-1)²=9 x²-7x+6=0 x(x-1)=x 2x²-5x-12=0 2(x-1=(x-1)(x-2)=0 (2x-1)²=9 x²-7x+6=0 x(x-1)=x 2x²-5x-12=0 2(x-1=(x-1)(x-2) 2x²+3x-18=0 3x²+2x-5=0 x²-4x-7=0.解一元二 用(公式法)解方程:x²+x-2=0 x²-4x+2=0 4x²-3x-5=x-2 3x(x-3)=2(x-1)(x+1),①x²+x-2=0 ②x²-4x+2=0③4x²-3x-5=x-2④3x(x-3)=2(x-1)(x+1) 解分式方程(要带步骤)解方程:(1):2/(x-3)=3/x; (2):6/(1-x)-(x+5)/[x(1-x)]=0; (3):2/(3x-1)-1=3/(6x-2); (4):10x/(2x-1)+5/(1-2x)=2; (5):(x+2)²/x²-3(x+2)/x+2=0; (6)x/(x²-4)+2/(x+2)=1/(x-2); (7)5/(x²+x)-1/(x²-