1.76除以0.68目录
计算结果为：$1.76/0.68=2.5882352941176467$
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一个人的身高是1.76米，凳子高0.68米，再加上手臂的长度，他站在凳子上能换掉2.5米高处的灯泡吗？
人，176，加手臂30，板凳68，加起来有两米五了···