Question

解方程x﹙x-1﹚分之1加x﹙x+1﹚分之1+.+﹙x+9﹚﹙x+10﹚分之1=x+10分之1

Answer 1

x﹙x-1﹚分之1加x﹙x+1﹚分之1+.+﹙x+9﹚﹙x+10﹚分之1=x+10分之1

1/(x-1)-1/x+1/x-1/(x+1)+...1/(x+9)-1/(x+10)=1/(x+10)

1/(x-1)-1/(x+10)=1/(x+10)

1/(x-1)=2/(x+10)

x+10=2(x-1)

x+10=2x-2

x=12

如追加其它问题,