5□5□5□5□5,請在□中填入“+”、“-”、“×”、“÷”四個符號(每個符號只填一次),組成一個算式,在各種各樣的填法組成的算式中,算式結(jié)果的最大值是
29
29
分析:題目要求只填運算符號,不加括號;那么運算順序是先算乘除,再算加減,要使運算的結(jié)果最大只要減的數(shù)最小即可.
解答:解:因為減號只能用一次,減數(shù)不能為0,那么5÷5=1做減數(shù)時,運算的結(jié)果最大:
5×5+5-5÷5=29.
故答案為:29.
點評:本題要從運算順序及運算后的數(shù)值增減情況綜合考慮,找到最佳方案.
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