一群兔子在一块地里拔萝卜
- 时间:2020-05-14 13:29:37
- 分类:数学世界
- 阅读:108 次
数学题:一群兔子在一块地里拔萝卜,其中2只兔子各拔4个,其余每只兔子都拔5个,则此时地里还剩12个萝卜未拔;如果每只兔子都拔6个,则正好拔完。问:有多少只兔子?有多少个萝卜?
数学题解答:此题可用假设法来解决,这样便可以化难为易。
假设那2只兔子也各拔5个萝卜,即所有的兔子都拔5个萝卜,则地里应只剩下10个萝卜。12-1-1=10(个)。
题目中兔子的只数是固定不变的。这样前后两种情况对比,前面每只兔子少拔1个萝卜。6-5=1(个)
导致最后剩下10个萝卜,可见兔子的只数是:10÷1=10(只)。
而萝卜的只数就是:10×6=60(只),或:10×5+10=60。
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