I___like that had you told me the truth earlier.
A.would not have done
B.would not do
C.will not do
D.would do
A.would not have done
B.would not do
C.will not do
D.would do
A.So you are here finally
B.Did you have a good trip
C.You must have had a tiring journey
D.How long did it take you to get here
设f(x,y)与φ(x,y)均为可微函数,且φˊ(x,y)≠0,已知(xo,yo)是f(x,y)在约束条件φ(x,y)=0下的一个极值点,下列选项正确的是().
A.若fˊx(x,yo)=0,则fˊy(xo,yo)=0
B.若fˊx(xo,yo)=0,则fˊy(xo,yo)≠0
C.若fˊx(xo,yo)≠0,则fˊy(xo,yo)=0
D.若fˊx(xo,yo)≠0,则fˊy(xo,yo)≠0
设f(x,y)与ψ(x,y)均为可微函数,且ψˊy(x,y)≠0,已知(xo,yo)是f(x,y)在约束条件ψ(x,y)=0下的一个极值点,下列选项正确的是()
A.若fˊx(xo,yo)=0则fˊy(xo,yo)=0
B.若fˊx(xo,yo)=0则fˊy(xo,yo)=0
C.若fˊx(xo,yo)≠0则fˊy(xo,yo)≠0
D.若fˊx(xo,yo)≠0则fˊy(xo,yo)≠0
【题目描述】
设f(x,y)与φ(x,y)均为可微函数,且φˊ(x,y)≠0,已知(xo,yo)是f(x,y)在约束条件φ(x,y)=0下的一个极值点,下列选项正确的是( ).A.若fˊx(x,yo)=0,则fˊy(xo,yo)=0
B.若fˊx(xo,yo)=0,则fˊy(xo,yo)≠0
C.若fˊx(xo,yo)≠0,则fˊy(xo,yo)=0
D.若fˊx(xo,yo)≠0,则fˊy(xo,yo)≠0
【我提交的答案】: C |
【参考答案与解析】: 正确答案:D |
设f(x,y)与φ(x,y)均为可微函数,且φˊy(x,y)≠0,已知(xo,yo)是f(x,y)在约束条件φ(x,y)=0下的一个极值点,下列选项正确的是().
A.若fˊx(xo,yo)=0,则fˊy(xo,yo)=0
B.若fˊx(xo,yo)=0,则fˊy(xo,yo)≠0
C.若fˊx(xo,yo)≠0,则fˊy(xo,yo)=0
D.若fˊx(xo,yo)≠0,则fˊy(xo,yo)≠0
设可微函数f(x,y)在点(xo,yo)处取得极小值,则下列结论正确的是().
A.f(xo,y)在y=yo处导数为零
B.f(xo,y)在y=yo处导数大于零
C.f(xo,y)在y=yo处导数小于零
D.f(xo,y)在y=yo处导数不存在