设f(x)=ax+b则①
(1)令x=-1有:3f(0)-2f(-2)=17把①带入得:3b-2(-2a+b)=17②
令x=1有:3f(2)-2f(0)=19把①带入得:3(2a+b)-2b=19③
②③联立解得a=1,b=13
此时f(x)=x+13
(2)令x=1有:f(2)=0把①带入得:2a+b=0④
令x=-1有:f(0)=0把①带入得:b=0⑤
联立④⑤解得:a=b=0
此时f(x)=0
设f(x)=ax+b则①
(1)令x=-1有:3f(0)-2f(-2)=17把①带入得:3b-2(-2a+b)=17②
令x=1有:3f(2)-2f(0)=19把①带入得:3(2a+b)-2b=19③
②③联立解得a=1,b=13
此时f(x)=x+13
(2)令x=1有:f(2)=0把①带入得:2a+b=0④
令x=-1有:f(0)=0把①带入得:b=0⑤
联立④⑤解得:a=b=0
此时f(x)=0