解（80-2x)(60-2x)x=1500

解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 解方程 x*x*x + 2*x -19 =0 x^2=(x+30)X(x-18)怎么解 解方程(x-6)(x^2+x+1)-x(x+1)(x-1)=x(2-5x) 解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7) 解方程：x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6 解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8) 解方程(x-2)/(x-3)-(x-3)/(x-4)=(x-5)/(x-6)-(x-6)/(x-7) 解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x) 解方程】(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3) 解方程：（x-8）/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)