84+47+16=47+(84+16),這是運(yùn)用了________.

加法交換律和結(jié)合律
分析:在84+47+16=47+(84+16)中,先運(yùn)用了加法交換律,變?yōu)?4+47+16=47+84+16,再運(yùn)用加法結(jié)合律,84和16結(jié)合,變?yōu)?7+(84+16),因此運(yùn)用了加法交換律和結(jié)合律.
解答:84+47+16=47+(84+16),這是運(yùn)用了(加法交換律和結(jié)合律).
故答案為:加法交換律和結(jié)合律.
點(diǎn)評(píng):此題考查了學(xué)生對(duì)運(yùn)算定律的熟練掌握程度.
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