x-3/5x=2/15
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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?
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
2x+3x+4x+5x+x+6x+7x=100
5x+15/x^2+x-6=A/x-2+B/x-3
(5X-15)-(2X+3)=X+12
15-(4-5x)=2x+(35-3x)
解方程:(x-2)(x-3)+2(x+6)(x-5)=3(x的平方-7x+15)
已知x -2x=5,求代数式x四次方+3x³-12x² -31x-15
x-3/5x=2/15