有关vexs的精选大全

定点向量vexs怎么写
1.定点A(设M(x,y)向量AM=(x+1,y)向量BM=(x-1,y)点M到点C(0,1)距离平方为:x^2+(y-1)^2向量AM乘向量BM:(x+1)(x-1)+y^2=x^2-1+y^2x^2-1+y^2=k*[x^2+(y-1)^2](k-1)x^2+(k-1)y^2+k-2ky+1=0当k=1时,y=1是一条直线当k不等于1...
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