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1/(D^2+2D+2)=1/2-1/2D,怎么算出来的啊!

题目详情
1/(D^2+2D+2)=1/2-1/2D,怎么算出来的啊!
▼优质解答
答案和解析
1/2-1/2D=(D-1)/2D1/(D^2+2D+2)=1/[(D+1)^2+1]=(D-1)/2D(D+1)^2+1=2D/(D-1)(D+1)^2=2D/(D-1)-1=(D+1)/(D-1)(D+1)^2-(D+1)/(D-1)=0(D+1)[(D+1)-1/(D-1)]=0D+1=0或(D+1)-1/(D-1)=0(D+1)-1/(D-1)=0(D+1)=1/(D-1)(D+1)(D...