15—35的数字中,其中五个数字相加,和值为149,有多少组数字?
2个回答
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解:149÷5=29……余4
这五个数的中间为30,共有4组数,即:
35,34,33,32,15
35,33,32,31,18
35,32,31,30,21
35,31,30,29,24
35,30,29,28,27
34,33,32,31,19
34,32,31,30,22
34,31,30,29,25
34,30,29,28,27
这五个数的中间为30,共有4组数,即:
35,34,33,32,15
35,33,32,31,18
35,32,31,30,21
35,31,30,29,24
35,30,29,28,27
34,33,32,31,19
34,32,31,30,22
34,31,30,29,25
34,30,29,28,27
追答
上述有误,予以纠正,34,30,29,28,27和为148,不合要求,另外再补充二组:
33,32,31,30,23
33,31,30,29,26共十组。
补充说明,并补充:
此题相当于三个抽屉原理的综和计算:
(1)和为149的5个数分别放到35一15的21个抽屉里计有46组,它们分别为:
35,34,33,32,15
35,34,33,31,16
35,34,33,30,17,
35,34,33,29,18
35,34,33,28,19
35,34,33,27,20
35,34,33,26,21
35,34,33,25,22
35,34,33,24,23。
35,34,32,31,17
35,34,32,30,18
35,34,32,29,19
35,34,32,28,20
35,34,32,27,21
35,34,32,26,22
35,34,32,25,23。
35,34,31,30,19
35,34,31,29,20
35,34,31,28,21,
35,34,31,27,22
35,34,31,26,23
35,34,31,25,24。
35,34,30,29,21
35,34,30,28,22
35,34,30,27,23
35,34,30,26,24。
35,34,29,28,23
35,34,29,27,24
35,34,29,26,25。
35,34,28,27,25。
35,33,32,31,18
35,33,32,30,19
35,33,32,29,20
35,33,32,28,21
35,33,32,27,22
35,33,32,26,23
35,33,32,25,24。
35,32,31,30,21
35,32,31,29,22
35,32,31,28,23
35,32,31,27,24
35,32,31,26,25。
35,31,30,29,24
35,31,30,28,25
35,31,30,27,26。
35,30,29,28,27。
计46组。
(2)从34一19共16个抽屉放5个数和为149共22组数:
34,33,32,31,19
34,33,32,30,20
34,33,32,29,21
34,33,32,28,22
34,33,32,27,23
34,33,32,26,24。
34,33,31,30,21
34,33,31,29,22
34,33,31,28,23
34,33,31,27,24
34,33,31,26,25。
34,33,30,29,23`
34,33,30,28,24
34,33,30,27,25。
34,33,29,28,25
34,33,29,27,26。
34,32,31,30,22
34,32,31,29,23
34,32,31,28,24
34,32,31,27,25。
34,31,30,29,25
34,31,30,28,26。
(3)23一33,5个和为149的放到11个抽屉中的5个抽屉里,共有8组:
33,32,31,30,23
33,32,31,29,24
33,32,31,28,25
33,32,31,27,26。
33,32,30,29,25
33,32,30,28,26
33,31,30,29,26
33,31,30,28,27
综上所述共76组
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