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51问答网 > 蜻蜓、蜘蛛、蝉三种昆虫共18只、共有脚118只、翅膀20对（蜘蛛8只脚、蜻蜓6只、2对翅膀、蝉6只

蜻蜓、蜘蛛、蝉三种昆虫共18只、共有脚118只、翅膀20对（蜘蛛8只脚、蜻蜓6只、2对翅膀、蝉6只

2025-03-14 21:42:27

推荐回答（1个）

回答1：

把蜻蜓和蝉看成一种6只脚的动物
假设全是6只脚，则：18×6=108只
蜘蛛有：（118-108）÷（8-6）=5只
蜻蜓和蝉共有：18-5=13只
假设全是蜻蜓：13×2=26对
蝉有：（26-20）÷（2-1）=6只
蜻蜓：13-6=7只

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