用椭圆标准公式表示100x^2-200x+81y^2+162y=7919
问题描述:
用椭圆标准公式表示100x^2-200x+81y^2+162y=7919
答案是1/81(x-1)^2+1/100(y+1)^2=1.
答
100x²-200x+81y²+162y=7919(100x²-200x+100)+(81y²+162y+81)=7919+100+81100(x²-2x+1)+81(y²+2y+1)=8100100(x-1)²+81(y+1)²=8100两边同时除以8100,得:(x-1)&...