1、4.14.24.54.6整数指数幂分数指数幂对数对数运算法则对数对照logaN=bab=N底数指数幂真数a0且a1对照logaN=bab=NN0定义式0a na11na定义式1na mnamnana定义式logaa 1log 1a0(ab)n=(am)n=运算法则aman=am+nanbnamn运算法则运算法则logaMN loglogaaMNlogaMNloglogaaMNlogqaMlogaqM练习1.计算:2032332;20.01;(3)0aa练习2.计算:3393182341631001.03254练习3.计算:842864练习4.指数式写成对数式.(口答)(1)26=64 (2)(
2、3)(4)124221393225125练习5.对数式写成指数式.(1)(口答)(2)(3)(4)10log 0.012 10log 10003413log82 163log 84练习6.求下列各式中真数N的值.(1)(2)82log3N 10log3N 练习7.计算:P106.4P106.5(口答)练习8.用运算法则整理:32(1)logax yz2 3(2)logayxz练习9.计算:881(1)log 3log333(2)log 6log 223(3)log(27 9)5(4)lg0.001练习9.计算,已知lg20.3010,lg30.4771(1)lg30 (2)lg0.6(3)lg 12 (4)lg150