Question

(文)給出四個函數分別滿足:①f(x+y)=f(x)+f(y);②g(x+y)=g(x)·g(y);③u(x·y)=u(x)+u(y);

④v(x·y)=v(x)·v(y).與下列函數圖象相對應的是

A.①—a ②—d ③—c ④—b                 B.①—b ②—c ③—a ④—d

C.①—c ②—a ③—b ④—d                 D.①—d ②—a ③—b ④—c

Answer 1

答案： (文)D  ①f(x+y)=f(x)+f(y),類比正比例函數,與d對應;

②g(x+y)=g(x)g(y),類比y=a^x,與a對應;

③u(x·y)=u(x)+u(y),類比y=log_ax,與b對應;

④v(xy)=v(x)v(y),類比y=x²,與c對應.