單項(xiàng)選擇題

已知由方程siny+xey=0,確定y是x的函數(shù),則dy/dx的值是:()

A.-(ey+cosy)/xey
B.-ey/cosy
C.-ey/(cosy+xey
D.-cosy/xey


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1.單項(xiàng)選擇題

設(shè)參數(shù)方程,確定了y是x的函數(shù),f″(t)存在且不為零,則d2y/d2x的值是:()

A.-1/f″(t)
B.1/[f″(t)]2
C.-1/[f″(t)]2
D.1/f″(t)

2.單項(xiàng)選擇題

(x+ex的值是:()

A.e
B.e
C.1
D.2

4.單項(xiàng)選擇題

設(shè)y=(1+x),則y′(1)等于:()

A.2
B.e
C.1/2-ln2
D.1-ln4

5.單項(xiàng)選擇題

已知,則dy/dx為:()

A.(t2-1)/2t
B.(1-t2)/2t
C.(x2-1)/2x
D.2t/(t2-1)