用因式分解法解下列方程 (3-x)^+4x(x-3)=0 9(x-2)^=4(x+1)^ (2x-1)^-x^-4x-4=0 x^-13x+12=42

作者&投稿:钦树 (若有异议请与网页底部的电邮联系)
用因式分解法解下列方程: (1)(4x-1)(5x+7)=0 (2)3x(x-1)=2-2x (3)(2x+3)^2=4(2x+3)~

(1)(4x-1)(5x+7)=0
x=-7/5或x=1/4
(2)3x(x-1)=2-2x
3x(x-1)+2(x-1)=0
(3x+2)(x-1)=0
x=-2/3,x=1
(3)(2x+3)^2=4(2x+3)
(2x+3)^2-4(2x+3)=0
(2x+3)(2x-1)=0
x=-3/2,x=1/2
(4)2(x-3)^2=x^2-9
2(x-3)^2-(x-3)(x+3)=0
(x-3)(2x-6-x-3)=0
(x-3)(x-9)=0
x=3或 x=9

我只会(1)和(2),献丑了。。。
(1)3x^2-12x=-12 (2)4x^2-144=0
解:3x^2-12x+12=0 解:(2x+12)(2x-12)=0
x^2-4x+4=0 2x+12=0 或 2x-12=0
(x-2)(x-2)=0 x1=-6 x2=6
(x-2)=0
x1=x2=2

(3-x)^2+4x(x-3)=0 ,5x^2 -18x+9=0, (5x-3)(x-3)=0, x1= 3/5, x2=3
9(x-2)^=4(x+1)^ 2, 5x^2 -44x +32=0, (5x-4)(x-8)=0, x1=4/5,x2=8
(2x-1)^-x^-4x-4=0, 3x^2 -8x -3=0, (3x+1)(x-3)=0, x1= -1/3, x2=3
x^-13x+12=42, x^2 -13x - 30=0, (x -15)(x+2)=0, x1=15,,x2=-2

好乱