計(jì)算:
(I)
6
1
4
-(π-1)0-(3
3
8
)
1
3
+(
1
64
)-
2
3

(II)log2(47×25)+log26-log23
分析:(I)根據(jù)
nan
=
a,n為奇數(shù)
|a|,n為偶數(shù)
,a0=1(a≠0),a
n
m
=
man
,可計(jì)算出(I)式的值;
(II)根據(jù)logaM+logaN=loga(M•N),logaM-logaN=loga(M÷N),logaNm=mlogaN,可計(jì)算出(II)式的值;
解答:解:(I)
6
1
4
-(π-1)0-(3
3
8
)
1
3
+(
1
64
)
-
2
3

=
25
4
-1-
3
27
8
+
3(43)2

=
5
2
-1-
3
2
+16
=16
(II)log2(47×25)+log26-log23
=log2(47×25×6÷3)
=log2(214×25×2)
=log2(220)
=20
點(diǎn)評(píng):本題考查的知識(shí)點(diǎn)是有理數(shù)指數(shù)冪的化簡(jiǎn)求值,對(duì)數(shù)的運(yùn)算性質(zhì),熟練掌握指數(shù)和對(duì)數(shù)的運(yùn)算性質(zhì)是解答的關(guān)鍵.
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