已知实数x,y满足x²+y²-6x-4y+12=0 求x-y的最大值与最小值.

学习时间:2026-11-13 05:00:44 阅读：6350

已知实数x,y满足x²+y²-6x-4y+12=0 求x-y的最大值与最小值.已知实数x,y满足x²+y²-6x-4y+12=0求x-y的最大值与最小值.最好有图,

高贵的黑米

2026-11-13 05:00:44



x²+y²-6x-4y+12=0(x-3)²+(y-2)²=1x=3+costy=2+sintx-y=3+cost-2-sint=cost-sint+1=√2sin(pai/4-t)+1最大值√2+1最小值-√2+1