解方程组(X-3)^2+y^2=9 x+2y=0
问题描述:
解方程组(X-3)^2+y^2=9 x+2y=0
答
x+2y=0,则x=-2y代入(X-3)^2+y^2=9,得
(-2y-3)^2+y^2=9
4y^2+12y+9+y^2=9
5y^2+12y=0
y(5y+12)=0
y=0或y=-12/5
y=0时,x=0
y=-12/5时,x=24?5