化简:x-2/x+2-x+2/x-2+16/x^2-4=
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化简:x-2/x+2-x+2/x-2+16/x^2-4=
x-2/x+2-x+2/x-2+16/x^2-4
=(x-2)^2/(x^2-4)-(x+2)^2/(x^2-4)+16/(x^2-4)
=((x-2)^2-(x+2)^2+16)/(x^2-4)
=((x-2-x-2)(x-2+x+2)+16)/(x^2-4)
=(-8x+16)/(x^2-4)
=-8(x-2)/(x-2)(x+2)
=-8/(x+2)
=(x-2)^2/(x^2-4)-(x+2)^2/(x^2-4)+16/(x^2-4)
=((x-2)^2-(x+2)^2+16)/(x^2-4)
=((x-2-x-2)(x-2+x+2)+16)/(x^2-4)
=(-8x+16)/(x^2-4)
=-8(x-2)/(x-2)(x+2)
=-8/(x+2)
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1
先化简,再求值:(x-2/x-x+2/x)/x-2/4x,x=2011
2x+3x+4x+5x+x+6x+7x=100
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
通分x+4/x*x+4x与x-5/x(x-5)-2(x-5)
约分 (X的平方+4x+3)(2x-x)^/(X^+X)(X^+X-6),
化简:x(x^2+x)/x^2(x^2-1)