Question

計(jì)算：(-2

1

3

)-1×(-

6

7

)-2+(-

2

3

)-2×(-

1

3

)0．

Answer 1

分析：根據(jù)負(fù)整數(shù)指數(shù)冪和零指數(shù)冪的運(yùn)算法則求解即可．

解答：解：原式=-

3

7

×

49

36

+

9

4

×1
=-

7

12

+

27

12

=

5

3

．

點(diǎn)評(píng)：本題主要考查了負(fù)指數(shù)冪的運(yùn)算，負(fù)整數(shù)指數(shù)冪的運(yùn)算，先把底數(shù)化成其倒數(shù)，然后將負(fù)整數(shù)指數(shù)冪當(dāng)成正的進(jìn)行計(jì)算．