f(x,y)=x^2+y^2+2xy－2x,g(x,y)=x^2+y^2－1.先考虑f(x,y)在圆内的驻点,af/ax=2x+2y－2＝0,af/ay=2y+2x＝0,无解.再考虑边界.令F(x,y ,a)=f(x,y)+ag(x,y),驻点方程为aF/ax=2x+2y－2+2ax=0,aF/ay=2y+2x+2ay＝0,第一个方...