十五枚硬币,面值分别为1分,2分,五分,一共三角五分,求这三种硬币多少枚.
十五枚硬币,面值分别为1分,2分,五分,一共三角五分,求这三种硬币多少枚.
是三元一次方程组
是三元一次方程组
数学人气:845 ℃时间:2020-02-04 01:57:03
优质解答
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=20 (3)根据客观条件 z≤5,而且z≠0且z≠1,所以2≤z≤5,当Z=2时,y=12,x=1当Z=3时,y=8,x=4当Z=4时,y=4...
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