(x-13)/-5+4=7
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)
2x+3x+4x+5x+x+6x+7x=100
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
方程 3x(7-2x)+5x(2x-1)=4x(x-3)+56
解分式方程:(x-4/x-5)-(x-5/x-6)=(x-7/x-8)-(x-8/x-9)
解方程 (x-5分之x-4)-(x-6分之x-5)=(x-8分之x-7)-(x-9分之x-8)速度
解方程 (X-4/X-5)+(X-8/X-9)=(X-7/X-8)+(X-5/X-6)
计算:1/(x^2-7x+10)+1/(x^2-x-2)+1/(x^2+5x+4)+1/(x^2+11x+28)=( )
x+1分之x+2减去x+3分之x+4=x+5分之x+6减去X+7分之x+8 (解方程)