下列计算不正确的是( ) A.±=±3 B.2ab+3ba=5ab C.(﹣1)0=1 D.(3ab2)2=6a2b4 答案:D【解答】解:A、±=±3,正确,故此选项错误; B、2ab+3ba=5ab,正确,故此选项错误; C、(﹣1)0=1,正确,故此选项错误; D、(3ab2)2=9a2b4,错误,故此选项正确; 故选:D.The Dongying-Hainan airline for about 5 months. I have taken the flights three times.A.is open B.has opened C.has been open D.has been opened