1. 求方程 (x+1)/(x+2)+(x+8)/(x+9)=(x+2)/(x+3)+(x+7)/(x+8)的解。
2. 求方程 1/(x*x+3x+2)+1/(x*x+5x+6)+1/(x*x+7x+12)+1/(x*x+9x+20)=1/8的解。
1. 求方程 (x+1)/(x+2)+(x+8)/(x+9)=(x+2)/(x+3)+(x+7)/(x+8)的解。
2. 求方程 1/(x*x+3x+2)+1/(x*x+5x+6)+1/(x*x+7x+12)+1/(x*x+9x+20)=1/8的解。