GRE数学题1题.3（r/3+s/4+5/3）与r-s+5比较大小2题.The sum of 2 and the num

GRE数学题
1题.3（r/3+s/4+5/3）与r-s+5比较大小
2题.The sum of 2 and the number of edges of a cube与The sum of the number of vertices of a cube and the number of faces of a cube大小
3题.The number of walking steps,each of length 0.4 meter,needed to walk completely along the perimeter of a square rug with side of length 8 meters与The number of walking steps,each of length of 0.5 meter needed to walk completely along the perimeter of a rectangular rug with length of 11meters and width of 8 meters求翻译跟解法

我都做过...
1.是新东方那本黄书吗?答案错了,实际应为D
2.翻译：2加上立方体的边的数量的总和,即为 2+12
立方体面的数量+立方体顶点的数量的综合,即为6+8
答案为C
3.每步走0.4米,走一个边长为8米的正方形要多少步?
每步走0.5米,走一个长为11米、宽为8米的长方形要多少步?
答案为A

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