Question

(文)给出四个函数分别满足: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).与下列函数图象相对应的是

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),类比正比例函数,与d对应;

②g(x+y)=g(x)g(y),类比y=a^x,与a对应;

③u(x·y)=u(x)+u(y),类比y=log_ax,与b对应;

④v(xy)=v(x)v(y),类比y=x²,与c对应.