百度作业网初三用适当的方法解下列方程
来源：学生作业帮 编辑：百度作业网作业帮 分类：数学作业 时间：2024/04/29 00:48:45
初三用适当的方法解下列方程
1）(2y-1)^2=-3(2y-1) => (2y-1)(2y-1+3)=0 => (2y-1)(2y+2)=0 => y1=1/2、y2=-1
2) x={1±√[1^2-4*(-1)]}/2 =>:x1=(1+√5)/2 、x2=(1-√5)/2
3) x^2-6x+9=0 => (x-3)^2=0 => x1=x2=3
4) 16(x+2)^2-25(x-1)^2=0 => [4(x+2)+5(x-1)]*[4(x+2)-5(x-1)]=0
=> (9x+3)(-x+13)=0
=> x1=-1/3、x2=13
2) x={1±√[1^2-4*(-1)]}/2 =>:x1=(1+√5)/2 、x2=(1-√5)/2
3) x^2-6x+9=0 => (x-3)^2=0 => x1=x2=3
4) 16(x+2)^2-25(x-1)^2=0 => [4(x+2)+5(x-1)]*[4(x+2)-5(x-1)]=0
=> (9x+3)(-x+13)=0
=> x1=-1/3、x2=13