(1)2x^2-4x-5=0 (2)-3x²-4x+4=0 (3)3x(x-1)=2-2x (4)(x-1)(
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/15 09:53:57
(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)=7
(6)(3-x)²+x²=9
详细过程……………………………………急!
(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!
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!
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
已知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
(x-2)²=(2x-3)² x²-4x=0 3x(x+1)=3x+3 x²-2
x²+3x-1=0,1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)
先化简再求值:(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x,其中x=3/2
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)
x(x^2-1)+2x^2 *(x+1)-3x*(2x-5)=x(3x^2-4x)-28
3X+(X+2)+(X+1)*(X-1)=4*(X²+8)
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值
5x-3(2x+1)=6x-4(5-3x)求x