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数学
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一次函数f(x)满足f(x+1)-2f(x-1)=5x+1
人气:196 ℃ 时间:2020-03-29 03:16:54
解答
设一次函数f(x)=AX+B
则有 F(X+1)-2F(X-1)=A(X+1)+B-2(A(X-1)+B)
=-AX+3A-B=5X+1
等式恒等
必然 -A=5 3A-B=1
==>A=-5,B=-16
所以F(X)=-5X-16
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