解方程解方程
(x+5)÷(x+7)+(x+2)÷(x+4)=(x+4)÷(x+6)+(x+3)÷(x+5)
参考答案:1-2/(x+7)+1-2/(x+4)=1-2/(x+6)+1-(1/x+5)
所以1/(x+7)+1/(x+4)=1/(x+6)+1/(x+5)
化简(2x+11)/(x^2+11x+28)=(2x+11)/(x^2=11x+30)
所以只能是2x+11=0,那么x=-5.5
ps:楼上说方程无解就是少考虑了2x+11=0的情况.
(x+5)÷(x+7)+(x+2)÷(x+4)=(x+4)÷(x+6)+(x+3)÷(x+5)
参考答案:1-2/(x+7)+1-2/(x+4)=1-2/(x+6)+1-(1/x+5)
所以1/(x+7)+1/(x+4)=1/(x+6)+1/(x+5)
化简(2x+11)/(x^2+11x+28)=(2x+11)/(x^2=11x+30)
所以只能是2x+11=0,那么x=-5.5
ps:楼上说方程无解就是少考虑了2x+11=0的情况.