Question

計(jì)算：(

2a

3b

)-2=

9b2

4a2

．

Answer 1

分析：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)算即可得解．

解答：解：（

2a

3b

）^-2=

9b2

4a2

．
故答案為：

9b2

4a2

．

點(diǎn)評(píng)：本題考查了負(fù)整數(shù)指數(shù)冪，熟記負(fù)整數(shù)指數(shù)次冪等于正整數(shù)指數(shù)次冪的倒數(shù)是解題的關(guān)鍵．