單項選擇題曲面z=x2+y2在(-1,2,5)處的切平面方程是:()

A.2x+4y+z=11
B.-2x-4y+z=-1
C.2x-4y-z=-15
D.2x-4y+z=-5


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4.單項選擇題

(2006)已知函數(shù)等于:()

A.2x+2y
B.x+y
C.2x-2y
D.x-y

5.單項選擇題(2009)設z=f(x2-y2),則dz等于:()

A.2x-2y
B.2xdx-2ydy
C.f′(x2-y2)dx
D.2f′(x2-y2)(xdx-ydy)