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34.5×0.26,0.345×2.6,34.5×2.6三个算式中得数最大的是________,得数最小的是________.

34.5×2.6    0.345×2.6
分析:根据积的变化规律可知,如果两个非零因数都扩大或缩小,那么积也随着扩大或缩小,积扩大或缩小的倍数是两个因数扩大或缩小的倍数的积.据此判断.
解答:以第一个算式34.5×0.26为依据,
对于0.345×2.6,第一个因数缩小了100倍,第二个因数扩大了10倍,则积缩小10倍,因此,0.345×2.6<34.5×0.26;
对于34.5×2.6,第一个因数不变,第二个因数扩了10倍,则积扩大10倍,因此,34.5×0.26<34.5×2.6,
由此,0.345×2.6<34.5×0.26<34.5×2.6,
所以三个算式中得数最大的是34.5×2.6,得数最小的是0.345×2.6.
故答案为:34.5×2.6,0.345×2.6.
点评:本题考查了积的变化规律的灵活应用.
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