有15枚硬币,共3角5分,求其中有几枚1分的、2分的、5分的
有15枚硬币,共3角5分,求其中有几枚1分的、2分的、5分的
数学人气:983 ℃时间:2020-03-23 03:37:34
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1分硬币1枚,2分硬币12枚,5分硬币2枚;或4枚,8枚,3枚;或7枚,4枚,4枚;或10枚,0枚,5枚提示:设1分,2分,5分硬币分别有x枚、y枚、z枚;根据题意,得x+y+z=15(1)x+2y+5z=35 (2)(2)-(1)得:y+4z...
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