20+0.8x=x-14 112-4x=2x(80-4x)
20+0.8x=x-14 112-4x=2x(80-4x)
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?
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20
已知x-4/x=6,求代数式2x²-20x/x²-14x+4除(1-x-12/2-x)的值
x-4x=102 x-0.8x=22