设y=f(t),t=φ(x)都可微,则dy=()。A、f'(t)dtB、φ'(x)dxC、f'(t)φ'(x)dtD、f'(t)dx
设y=f(t),t=φ(x)都可微,则dy=()。
- A、f'(t)dt
- B、φ'(x)dx
- C、f'(t)φ'(x)dt
- D、f'(t)dx
相关考题:
单选题设y=f(lnx)ef(x),其中f可微,则dy=( )。A[f′(lnx)ef(x)+f′(x)f(lnx)ef(x)]dxB[f′(lnx)ef(x)/x+f′(x)f(lnx)ef(x)]dxC[f(lnx)ef(x)/x+f(x)f(lnx)ef(x)]dxD[f′(lnx)ef(x)/x+f(x)f(lnx)ef(x)]dx
单选题设函数y=y(x)由方程y=f(x2+y2)+f(x+y)所确定,且y(0)=2,其中f是可导函数,f′(2)=1/2,f′(4)=1,则dy/dx|x=0=( )。A1/5B1/7C-1/7D-1/5
单选题设函数y=y(x)由方程y=f(x2+y2)+f(x+y)所确定,且y(0)=2,其中f是可导函数,f′(2)=1/2,f′(4)=1,则dy/dx|x=0=( )。A1B-1C1/7D-1/7
单选题设y=f(lnx)ef(x),其中f可微,则dy=( )。A[f(lnx)ef(x)/x+f′(x)f(lnx)ef(x)]dxB[f′(lnx)ef(x)/x+f′(x)f(lnx)ef(x)]dxC[f′(lnx)ef(x)/x+f(x)f(lnx)ef(x)]dxD[f(lnx)ef(x)/x+f(x)f(lnx)ef(x)]dx
单选题设y=f(lnx)ef(x),其中f可微,则dy=( )。A[f′(lnx)ef(x)/x-f′(x)f(lnx)ef(x)]dxB-[f′(lnx)ef(x)/x+f′(x)f(lnx)ef(x)]dxC[f′(lnx)ef(x)/x+f′(x)f(lnx)ef(x)]dxD-[f′(lnx)ef(x)/x-f′(x)f(lnx)ef(x)]dx