x/5-x/6=15

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? 5x+15/x^2+x-6=A/x-2+B/x-3 2x+3x+4x+5x+x+6x+7x=100 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 (X-5)(X-6)=X-5 (2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x 解方程：(x-2)(x-3)+2(x+6)(x-5)=3(x的平方-7x+15) 四道方程：2x+6=5x 6x-28=2x 8(x-3.6)=0.8x 15x-110+7x=110