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x²+y²-2(t+3)x+2(1-4t²)y+16t^4+9=0
(x-(t+3))²+(y+(1-4t²)²)+16t^4+9=(t+3)²+(1-4t²)²
(x-(t+3))²+(y+(1-4t²)²)+16t^4+9=t²+6t+9+1-8t²+16t^4
(x-(t+3))²+(y+(1-4t²)²)=-7t²+6t+1
半径必须大于0,所以
-7t²+6t+1>0
7t²-6t-1<0
(7t+1)(t-1)<0
-1/7<t<1
t的取值范围是(-1/7,1)
令R²=-7t+6t+1
当t=(-1/7+1)/2=3/7时,R有最大值
R²(max)=-7(3/7)²+6(3/7)+1=16/7
R(max)=(4根号7)/7
(x-(t+3))²+(y+(1-4t²)²)+16t^4+9=(t+3)²+(1-4t²)²
(x-(t+3))²+(y+(1-4t²)²)+16t^4+9=t²+6t+9+1-8t²+16t^4
(x-(t+3))²+(y+(1-4t²)²)=-7t²+6t+1
半径必须大于0,所以
-7t²+6t+1>0
7t²-6t-1<0
(7t+1)(t-1)<0
-1/7<t<1
t的取值范围是(-1/7,1)
令R²=-7t+6t+1
当t=(-1/7+1)/2=3/7时,R有最大值
R²(max)=-7(3/7)²+6(3/7)+1=16/7
R(max)=(4根号7)/7
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