單項(xiàng)選擇題

過點(diǎn)M0(-1,1)且與曲線2ex-2cosy-1=0上點(diǎn)(0,π/3)的切線相垂直的直線方程是:()

A.y-π/3=(/2)x
B.y-π/3=-(2/)x
C.y-1=(/2)(x+1)
D.y-1=-(2/)(x+1)


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1.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

2.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)

3.單項(xiàng)選擇題

(x+ex的值是:()

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

5.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