解方程9y^2=(y-1)^2 (4x-1)^2=(1-5x)^29y^2=(y-1)^2 (4x-1)^2=(1-5x)^2x-y=2 x^2-y^2=6 则x=_____ y=_____
问题描述:
解方程9y^2=(y-1)^2 (4x-1)^2=(1-5x)^2
9y^2=(y-1)^2
(4x-1)^2=(1-5x)^2
x-y=2 x^2-y^2=6 则x=_____ y=_____
答
x=2/9, y=-1/2
答
你这是两个题目吧
9y^2=(y-1)^2
9y^2-(y-1)^2 =0
(3y+y-1)(3y-y+1)=0
y=1/4 y=-1/2
同理:x=9/2或x=0
第二题 x=y+2 代入 得 x=5/2 y=1/2