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Pt=(a+c)/b-(d/b)'P.L =(atc)/b-(d/b)/a+c)/b-(d/b)P-2 =(a+c)/b+(-d/b)a+e/b+l/b)2P2 (a+c)/b+(d/b (a+c)/b +(d /b)2/a+c)/b-(d/bP./ =(a+c)/b+(d/b)(a+c)/b+(d/b2(a+c/6 d/b)3 -3 20095-7中宏(24) 《中宏》讲义,张延著。版权所有2009-5-7 中宏(24) 《中宏》讲义,张延著。版权所有 12 • Pt = (a+c)/b - (d/b)1 Pt-1 • = (a+c)/b - (d/b)[(a+c)/b - (d/b)Pt-2 ] • = (a+c)/b + (- d/b)(a+c)/b + (d/b)2 Pt-2 • = (a+c)/b + (- d/b)(a+c)/b • + (d/b)2[(a+c)/b - (d/b)Pt-3 ] • = (a+c)/b + (- d/b)(a+c)/b + (d/b)2(a+c)/b • - (d/b)3 Pt-3
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