分析:(1)根據(jù)任何非零數(shù)的零次冪等于1,負(fù)整數(shù)指數(shù)次冪等于正整數(shù)指數(shù)次冪的倒數(shù)進(jìn)行計(jì)算即可得解;
(2)根據(jù)積的乘方的性質(zhì)和同底數(shù)冪相乘,底數(shù)不變指數(shù)相加進(jìn)行計(jì)算即可;
(3)根據(jù)積的乘方的性質(zhì),和同底數(shù)冪相乘,底數(shù)不變指數(shù)相加,然后利用負(fù)整數(shù)指數(shù)次冪等于正整數(shù)指數(shù)次冪的倒數(shù)計(jì)算;
(4)根據(jù)積的乘方的性質(zhì)和同底數(shù)冪相乘,底數(shù)不變指數(shù)相減計(jì)算,再根據(jù)負(fù)整數(shù)指數(shù)次冪等于正整數(shù)指數(shù)次冪的倒數(shù)進(jìn)行計(jì)算.
解答:解:(1)(
-
)
0-(-
)
-2=1-4
=-3;
(2)(m
-3n)
-2•(2m
-2n
-3)
-2=m
6n
-2•2
-2m
4n
6=
m
6+4n
-2+6=
m
10n
4;
(3)a
-2b
2•(-2a
2b
-2)
-2÷(a
-4b
2)
=a
-2b
2•(-2)
-2a
-4b
4÷(a
-4b
2)
=
a
-2-4-(-4)b
2+4-2=
a
-2b
4=
;
(4)(2m
2n
-3)
3(-mn
-2)
-2=2
3m
6n
-9(-m)
-2n
4=8m
6-2n
-9+4=8m
4n
-5=
.
點(diǎn)評(píng):本題考查了負(fù)整數(shù)指數(shù)次冪等于正整數(shù)指數(shù)次冪的倒數(shù),零指數(shù)冪,以及積的乘方的性質(zhì)和同底數(shù)冪相乘,底數(shù)不變指數(shù)相加的性質(zhì),熟記性質(zhì)是解題的關(guān)鍵,難點(diǎn)在于理清指數(shù)的變化.