Question

用正整數(shù)指數(shù)冪表示5a^-2bc^-1=________．

Answer 1

分析：根據(jù)負(fù)整數(shù)指數(shù)冪的運(yùn)算法則進(jìn)行計(jì)算．
解答：原式=5b×=．
點(diǎn)評：負(fù)整數(shù)指數(shù)冪的運(yùn)算規(guī)則：任何不等于零的數(shù)的-n（n為正整數(shù)）次冪，等于這個(gè)數(shù)的n次冪的倒數(shù)．
即：a^-n=（a≠0，且n是正整數(shù)）．