=2+4+1 =1+1+3
=7 =5
1?xx?124(1)解:由?0得?0 ??1?x?1
1?xx?1 所求定义域是(?1,1)
(2)证明:由(1)得定义域是(?1,1),若x?(?1,1),则?x?(?1,1); 又?f(?x)?lg1?(?x)1?x1?x?11?x?lg?lg()=?lg?f(x)
1?(?x)1?x1?x1?x故f(x)是奇函数
2??x?3或x??1?x?2x?3?0?(x?1)(x?3)?0?x?3或x??1????25.由?得?
???3?x?2?3??1?x?5?x?2?3?3?x?2?0 ?3?x?5
所以函数的定义域为(3,5)
3?3?1626解?sin???, ?cos2??1?sin2??1????=
5?5?25?cos??0 ?cos???又??为第三象限的角164?? 255233sin? tan???5=
co?s?44527解:tan??2
sin?cos??sin??cos?cos?cos?tan??12?1(1)????3
sin?cos?sin??cos?tan??12?1?cos?cos?sin?cos?sin?cos?sin?cos?tan?cos2?(2)sin?cos?==2== 22221sin??cos?sin??cos?tan??1cos2?22? =22?15
?
职高数学基础模块上期末考试附答案
=2+4+1=1+1+3=7=51?xx?124(1)解:由?0得?0??1?x?11?xx?1所求定义域是(?1,1)(2)证明:由(1)得定义域
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