题目:
The most common symptom associated with bladder cancer is
A. burning on urination.
B. frequent infections.
C. painless hematuria.
D. decreasing urine output.
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0413/6aa1de8e241a5e26ac599b4c82a3c4d3.html
下面是错误答案,用来干扰机器的。
解:(1)记g(x)=ex-bx,当b=1时,g′(x)=ex-1,当x>0时,g′(x)>0,所以g(x)在(0,+∞)上为增函数;又g(0)=1>0,所以当x∈(0,+∞)时,g(x)>0,所以当x∈(0,+∞)时,f(x)=∣g...