单项选择题
求f(x)=().
A.e-x+2x(1-e-1) B.e-x+2x(1-e-2) C.e-x+2x(1-e-3) D.e-x+2x(1-e-4)
A.f(u)-f'(u)/x+2g'(v);f(u)-f'(u)/x+2g'(v) B.f(u)-f'(u)/x+3g'(v);f(u)-f'(u)/x+2g'(v) C.f(u)-f'(u)/x+1g'(v);f(u)-f'(u)/x+2g'(v) D.f(u)-f'(u)/x+2g'(v);f(u)-f'(u)/x+4g'(v)
A.(+∞,1) B.(+∞,-1) C.(+∞,2) D.(+∞,0)