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llllllllllllllllllllllllllllllllllllllllllllllllll (18 11:40

来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/11 03:34:44
llllllllllllllllllllllllllllllllllllllllllllllllll (18 11:40:56)
已知函数f(X)=ax+b,若f(0)=1,且f(x+1)=f(x+1)=f(x)+3,求f(x).
llllllllllllllllllllllllllllllllllllllllllllllllll (18 11:40
将f(0)带进去得到b=1 ,则f(x+1)=a(x+1)+1 ,f(x)+3=ax+4
又f(x+1)=f(x)+3,即a(x+1)+1 =ax+4 化简得到a=3
所以f(x)=3x+1