27+91=91+
27
27
分析:根據(jù)加法交換律,兩個(gè)數(shù)相加,交換加數(shù)的位置和不變.據(jù)此填空即可.
解答:解:27+91=91+27;
故答案為:27.
點(diǎn)評(píng):此題考查的目的是理解掌握加法交換律的意義,并且能夠靈活運(yùn)用加法交換律進(jìn)行簡(jiǎn)便計(jì)算.
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