问题
解答题
计算下列各式: (1)2log32-log3
(2)
|
答案
(1)2log32-log3
32 |
9 |
=2log32-(log332-log39)+3log32-5log59
=2log32-5log32+2+3log32-9
=log3[(4×8)÷32]-7
=-7.
(2)
8n+1•(
| ||
4n•8-2 |
=
23n+3•
| ||
22n•2-6 |
=23n+3-2n-1-2n+6
=28-n.
计算下列各式: (1)2log32-log3
(2)
|
(1)2log32-log3
32 |
9 |
=2log32-(log332-log39)+3log32-5log59
=2log32-5log32+2+3log32-9
=log3[(4×8)÷32]-7
=-7.
(2)
8n+1•(
| ||
4n•8-2 |
=
23n+3•
| ||
22n•2-6 |
=23n+3-2n-1-2n+6
=28-n.