x-2/5x=14
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
已知x*x-5x=14,求(x-1)(2x-1)-(x+1)*(x+1)+1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?
5x+2=-8 x=30 3x=5x-14 x
(x-1)(2x-1)-(x+1)2+1,其中x²-5x=14,
1、14x(x+6)-6x=8x(2x+5)
已知x²-5x=14,求(x-1)(2x-1)-(x+1..
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
2x+3x+4x+5x+x+6x+7x=100
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)