两式相减得: 12x+10y=48
y=4.8-1.2x
x^2+4x+4+7.8^2+1.44x^2-18.72x=52
2.44x^2-14.72x+12.84=0
得两个交点:(x1,y1),(x2,y2)
x1=(7.36+√22.84 )/2.44
x2=(7.36-√22.84)/2.44
y1=4.8-1.2x1
y2-4.8-1.2x2
两式相减得: 12x+10y=48
y=4.8-1.2x
x^2+4x+4+7.8^2+1.44x^2-18.72x=52
2.44x^2-14.72x+12.84=0
得两个交点:(x1,y1),(x2,y2)
x1=(7.36+√22.84 )/2.44
x2=(7.36-√22.84)/2.44
y1=4.8-1.2x1
y2-4.8-1.2x2