解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)=5/(xx+11x-7
解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)=5/(xx+11x-7
数学人气:888 ℃时间:2019-11-21 20:15:45
优质解答
∵1/(x^2+x)=1/[x(x+1)]=1/x-1/(x+1), 1/(x^2+3x+2)=1/[(x+1)(x+2)]=1/(x+1)-1/(x+2), 1/(x^2+5x+6)=1/[(x+2)(x+3)]=1/(x+2)-1/(x+3), 1/(x^2+7x+12...
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