(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84
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(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=
(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84
(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84
(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84
解X么
(19x-x²)/(x+1)*19/(x+1)=84
（361X-X²）/（X+1）²-84（X+1）²/（X+1）²=0
（361X-X²-84X²-168X-84）/（X+1）²=0
（84X²-93X+84）/（X+1）²=0
无实数解
题不全
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分解因式----（X*X-X)(X*X-X-2)+1
】x(x+1)+x^2(x-1)
1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做
(x-2)(x+1)(x+4)(x+7)=19
（x-2)(x+1)(x+4)(x+7)=19
计算:1/x(x-1)+1/(x-1)(x-2)+1/(x-2)(x-3)+.+1/(x-19)(x-20)
(19x-x^2)/(x+1)*(x+(19-x)/(x+1)=84
解方程[(19x-x^2)/(x+1)][x+(19-x)/(x+1)]=84.
解方程：(19x-x^2)/(x+1)*(x+(19-x)/(x+1))=84
x-1/x-2
{2X+1}+{X}
(x^2-1)/x
x^2-1/x
2X+|X+1|