对数运算公式

01log.1a1log.2aabnbanaloglog.3bnbaanlog1log.4abbalog1log.5NMNMaaaloglog)(log.6NMNMaaalogloglog.7babalog:.8对数恒等式abbccalogloglog.9换底公式：NbbaaNlog.10指对互换公式（注意：公式成立的条件；公式正用与逆用。如xxaalog2log2）11.解指数方程：先化成同底指数，)()()()(xgxfaaxgxf12.解对数方程：先化成同底对数，)()(0)(0)()(log)(logxgxfxgxfxgxfaa13.解指数不等式：先化成同底指数，)()(xgxfaa（1）当10a时，原不等式同解于)()(xgxf；（2）当1a时，原不等式同解于)()(xgxf。14.解对数不等式：先化成同底对数数，)(log)(logxgxfaa（1）当10a时，原不等式同解于)()(0)(0)(xgxfxgxf；（2）当1a时，原不等式同解于)()(0)(0)(xgxfxgxf。15.形如02cbkakxx（或02cbkakxx）：换元，令tkx，先解t再解x。16.形如0log)(log2cxbxakk（或0log)(log2cxbxakk）：换元，令txklog，先解t再解x。