25的X次方等于2000,80的Y次方等于2000
即取对数:X=lg2000/lg25,Y=lg2000/lg80,两式子加一下就出答案:lg25/lg2000+lg80/lg2000=(lg25+lg80)/lg2000=lg2000/lg2000=1
25的X次方等于2000,80的Y次方等于2000
即取对数:X=lg2000/lg25,Y=lg2000/lg80,两式子加一下就出答案:lg25/lg2000+lg80/lg2000=(lg25+lg80)/lg2000=lg2000/lg2000=1