Elementary School Mathematics Questions and Answer Analysis以下是一些小学数学中与环境保护有关的题目及答案解析: **一、题目1** 1. **题目内容**:我市今年计划植树约84万棵,前35天栽了49万棵。照这样计算,完成全部任务要多少天?(用比例解) 2. **答案解析**: - 设完成全部任务要\(x\)天。 - 因为工作效率是一定的,所以植树的棵数和天数成正比例关系。 - 可列出比例式:\(\frac{49}{35}=\frac{84}{x}\)。 - 交叉相乘得到:\(49x = 84×35\)。 - 先计算\(84×35 = 2940\)。 - 再计算\(x=\frac{2940}{49}=60\)天。 **二、题目2** 1. **题目内容**:小兰站在西北部一片森林中,小兰的身高1.5m,她的影子长是2.4m。如果同一时间,同一地点测得一棵树的影子长4m,这棵树有多高? 2. **答案解析**: - 在同一时间、同一地点,物体的高度和影子的长度的比值是一定的。 -...
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