问题
解答题
化简或求值:(1)lg8+lg125-log0.5
(2)
|
答案
(1)lg8+lg125-log0.5
+3log321 4
=lg(8×125)-2+2
=lg1000=3.
(2)
(a>0)a3• 3 a (a
)4a-1 2 1 3
=a
•a3 2 1 6 a2•a- 1 3
=a
+3 2
-2+1 6 1 3
=a0
=1.
化简或求值:(1)lg8+lg125-log0.5
(2)
|
(1)lg8+lg125-log0.5
+3log321 4
=lg(8×125)-2+2
=lg1000=3.
(2)
(a>0)a3• 3 a (a
)4a-1 2 1 3
=a
•a3 2 1 6 a2•a- 1 3
=a
+3 2
-2+1 6 1 3
=a0
=1.