来自郝井华的问题
【已知a、b满足a-b+ab=0,且ab≠0,则1a−1b的值是()A.1B.-1C.1abD.b−aab】
已知a、b满足a-b+ab=0,且ab≠0,则1a−1b的值是()
A.1
B.-1
C.1ab
D.b−aab
1回答
2020-03-10 11:50
【已知a、b满足a-b+ab=0,且ab≠0,则1a−1b的值是()A.1B.-1C.1abD.b−aab】
已知a、b满足a-b+ab=0,且ab≠0,则1a−1b的值是()
A.1
B.-1
C.1ab
D.b−aab
∵ab≠0,
∴1a−1b