数学题:甲、丙两组人比乙组人数多2倍还多2人
- 时间:2020-05-11 16:38:51
- 分类:数学世界
- 阅读:135 次
数学题:甲、乙、丙三个组人数的比是2:3:5,甲、丙两组人比乙组人数多2倍还多2人,求各组人数?(由“劣徒”同学提出)
数学题解答(“保护色”同学解答):用方程解答如,设每份人数是x人。根据“甲、丙两组人比乙组人数多2倍还多2人”来列方程。
2x + 5x – 2 = 3x × 2
7x – 2 = 6x
x = 2
甲组:2x= 2 × 2 = 4
乙组:3x= 3 × 2 = 6
丙组:5x= 5 × 2 = 10
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