如果x*3是表示x³时,可解,如果是其他意思则请说明.
Z'(x)=3x²-3y
Z'(y)=3y²-3x
相加为零,求极值
3x²-3y+3y²-3x=0
3(x-1/2)²+3(y-1/2)²=3/2
(x-1/2)²+(y-1/2)²=1/2
可见只有当x=1/2, y=1/2时
Z有最小值=1/8+1/8-3/4+9=17/2
猜你喜欢
- 14分之一（2X+5）的三次方=2*3的三次方
- 2I am sorry.I didn't catch what you said just now.I said I ___to Beijing.A.will go B.went C.am going
- 3张志和《渔歌子》
- 4it's obvious to many students that they shouldo more reading.
- 5You don’t know about the difficulty I had ______the work then at all.
- 6f(x)=3x+5的定义域和值域是什么?
- 7【题西林壁】是宋代诗人苏轼的作品,作者号
- 8t℃时，某物质的溶液220g，蒸发去15g水后，析出晶体6g，又蒸发去10g水，析出6g晶体，再蒸去10g水又析出晶体的质量为（ ） A.4g B.6g C.10g D.15g
- 9一只规格为"220V,2000W"的电炉,求电路在正常工作时的电阻...
- 10--____she a French student ____ a German student?--She ____ a German student.