1/a+1/b=1 ,1/a+1/b+1/c=2.7,1/c=?
1/a+1/b=1 ,1/a+1/b+1/c=2.7,1/c=?
日期：2022-01-31 13:17:15 人气：1
解：
1/a+1/b+1/c=2.7
1/a+1/b+1/c=9/10
1/c=9/10-(1/a +1/b)
1/a+ 1/b=1
1/c=9/10 -1=-1/10
1/a+1/b+1/c=2.7
1/a+1/b+1/c=9/10
1/c=9/10-(1/a +1/b)
1/a+ 1/b=1
1/c=9/10 -1=-1/10