用因式分解法解方程2(x-3)=x的平方-9
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解(x-3)²+2x(x-3)=0(x-3)(x-3+2x)=0(x-3)(3x-3)=0∴x=3或x=1再问:应该用提公因式法?再答:提了提了(x-3)∴(x-3)²+2x(x-
(2x+3)²-(x-2)²=0[(2x+3)+(x-2)][(2x+3)-(x-2)]=0(3x+1)(x+5)=0x1=-1/3,x2=-5
(3x-2)(5x+1)=0,✘1=-1/5,✘2=2/3再问:给个过程再答:这不是过程吗?再答:后面的提2出来,再答:在移项再问:咋变的再答:2(5x+1)再问:好了我会
(3-x)^2=x-3(x-3)(x-3)=x-3(x-3)(x-3-1)=0x1=3x2=4
(2x+1)²=3(2x+1)(2x+1)²-3(2x+1)=0(2x+1)[(2x+1)-3]=0(2x+1)(2x-2)=02x+1=0或2x-2=0x=-1/2或x=1
(x-3)²=2x(3-x)(3-x)²=2x(3-x)(3-x-2x)(3-x)=0(3-3x)(3-x)=0x1=1,x2=3
5x(3x+2)=6x+45x(3x+2)=2(3x+2)5x(3x+2)-2(3x+2)=0(5x-2)(3x+2)=0x1=2/5x2=-2/3
x(3x-2)-6x²=03x²-2x-6x²=02x+3x²=0x(3x+2)=0x1=0x2=2/3再问:我想知道在第三部的时候6x²去哪里了?再
移项4x(2x+1)-3(2x+1)=0提取公因式(2x+1)(4x-3)=0
(2x+3)²-3(2x+3)-4=0(2x+3-4)(2x+3+1)=0(2x-1)(2x+4)=02x-1=0或2x+4=0x1=1/2x2=-2【俊狼猎英】团队为您解答再问:为什么要把
原方程就是X^2-5x-3=0X^2-5x+25/4-37/4=0(x-5/2)^2-(√37/2)^2=0(x-5/2+√37/2)(x-5/2-√37/2)=0x=5/2-√37/2或者x=5/2
2x(5x-1)=3(5x-1)2x(5x-1)-3(5x-1)=0(5x-1)(2x-3)=05x-1=0或2x-3=0得x=1/5或x=3/2如还不明白,请继续追问.手机提问的朋友在客户端右上角评
原式变形得√3x^2-x=0x(√3x-1)=0x=0,√3x-1=0x=0.x=√3/3
x的解为-2/3或-4移项(x-1)²=(2x+3)²(x-1)²-(2x+3)²=0得(x-1+2x+3)(x-1-2x-3)=0因此x-1+2x+3=0,3
3x(x-1)=2(x-1)3x²-3x=2x-23x²-5x+2=0(3x-2)(x-1)=03x-2=0,x-1=0所以x=2/3或x=1再问:3x²-5x+2=0(
3x(x-1)+2(x-1)=0,(x-1)(3x+2)=0,x-1=0或3x+2=0,所以x1=1,x2=-23.
先把原方正展开之后就容易了再问:是用因式分解法啊!
(2x-3)(x+1)=3,2x^2-x-3=3,2x^2-x-6=0,(2x+3)(x-2)=02x+3=0,x-2=0x1=-3/2,x2=2
x(2-3x)+3x=2x(2-3x)=2-3x(x-1)(2-3x)=0x=1或者x=2/3````````````````````````````````````````再问:请问第三步是怎么得到