x²-2(m+3)x+(m+3)²+y²+2(1-4m²)y+(1-4m²)²=(m+3)²+(1-4m²)²-16m的4次方-9[x-(m+3)]²+[y+(1-4m²)]²=m²+6m+9+1-8m²+16m的4次方-16m的4次方-9[x-(m+3)]²+[y+(1-4m²)]²= -7m²+6m+1∴-7m²+6m+1>07m²-6m-1<0(7m+1)(m-1)<0∴-1/7
