解方程数学问题x+1/x+2+x+2/x+3=x+3/x+4+x+4/x+5
1个回答
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(X+1/X+2)+(X+2/X+3)=(X+3/X+4)+(X+4/
X+5)
[(x+2)-1]/(x+2)+[(x+3)-1]/(x+3)=1-1/(x+4)+1-1/(x+5)
(后面我偷懒了)
1/(x+2)+1/(x+3)=1/(x+4)+1/(x+5)
1/(x+2)-1/(x+4)=1/(x+3)-1/(x+5)
1/(x+2)(x+4)=1/(x+3)(x+5)
(x+2)(x+4)=-(x+3)(x+5)
x^2+6x+8=-x^2-8x-15
2x^2+14x+23=0
x=[-14±√(196-184)]/4=(-7±√3)/2
经检验,x=(-7±√3)/2是原方程的根!
X+5)
[(x+2)-1]/(x+2)+[(x+3)-1]/(x+3)=1-1/(x+4)+1-1/(x+5)
(后面我偷懒了)
1/(x+2)+1/(x+3)=1/(x+4)+1/(x+5)
1/(x+2)-1/(x+4)=1/(x+3)-1/(x+5)
1/(x+2)(x+4)=1/(x+3)(x+5)
(x+2)(x+4)=-(x+3)(x+5)
x^2+6x+8=-x^2-8x-15
2x^2+14x+23=0
x=[-14±√(196-184)]/4=(-7±√3)/2
经检验,x=(-7±√3)/2是原方程的根!
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