2.1.1指数与指数幂的运算练习题1.对于a0,r,sQ,以下运算中正确的是()rsrsrsrsrsrsA.aaaB.(a)aC.arrrD.abab()abb1222.计算2的结果是()A.2B.2C.2D.2223.下列各式成立的是()5121322b561533A.mnmn3abC.633D.42B.2a322224.已知xx22且x1,则xx的值为()A.2或-2B.-2C.6D.225.已知34则x等于()x1343A.8B.D.22C.846.设bbx12,y12,那么y等于()xx1x1x1D.A.B.C.x1xx1x13x4yxy3,则1027.若102,10y2xyx1,则8.已知22并且93xy2x2x2x2x229.已知y1ee,y2ee,求y2y1.10.解方程.xx14280
答案:1.C2.C3.D4.D5.C6.B7.D228.99.A10.111.-412.x2