1/a+1/b=1①
1/b+1/c=6②
1/c+1/a=3③
①+②+③
2(1/a+1/b+1/c)=10
1/a+1/b+1/c=5④
④-①
1/c=4
∴c=1/4
④-②
1/a=-1
∴a=-1
④-③
1/b=2
∴b=1/2
即:方程组的解a=-1;b=1/2;c=1/4
1/a+1/b=1①
1/b+1/c=6②
1/c+1/a=3③
①+②+③
2(1/a+1/b+1/c)=10
1/a+1/b+1/c=5④
④-①
1/c=4
∴c=1/4
④-②
1/a=-1
∴a=-1
④-③
1/b=2
∴b=1/2
即:方程组的解a=-1;b=1/2;c=1/4