2.\r2(9+1)20\r(3)l!=9+2911-\r20\rnopj'64,8Yn(n+2)+1=(n+1)2Y.\r25.qrHstuvwaxyo2z34'\r(1)Hs%#$5{3|}~T9,#$-4{2|}~\r69,D(Hs%#$Hm{Hn|}~QR|m-n|.#$Ha{-EvaluationWarning:ThedocumentwascreatedwithSpire.PDFfor.NET.\r1|}~4,a=3-5.\r(2)Hs%#$Ha}R-5t2~(|a+5|+|a-2|w.\r(3)aw,|a+4|+|a-2|+|a-5|w,wZ.\rP,P!1PSPtPJPII2IIttt\r<=>?(1)Hs%|}~QR|}#$Huvw0oi'\r¡#$Ha}R-5t2~ia-5VaV2,Nuvw¢£¤l\r!¥¦uvw§¨awiY\r©|a+4|+|a-2|+|a-5|#$Hs%Ha{H-4,2,5~~{(uvw\rª]w.\r0'(1)ZHs%|}~«!ia'Hs%#$5{3|}~|5\r-3|=2Y\r#$-4{2|}~|-4-2|=6Y\r#$Ha{-1|}~4,¬|a+1|=4,0W2=32=-5,\rnopj'2,6,3-5Y\r(2),/-5<a<2,\r|a+5|+|a-2|=a+5+2-a=7Y\r(3)@@@|a+4|+|a-2|+|a-5|#$Hs%Ha{H-4,2,5~~{(\r<'.a=2{(\r/.|a+4|+|a-2|+|a-5|=|a+4|+|a-5|=|5-(-4)|=9.\r.@.a=2(|a+4|+|a-2|+|a-5|w(w9.
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