is a perfect square if and only if (m+1)·(m+2)… n. is a perfect square. For the five answer choices, that quantity is 121, 121⋅ 122, 120, 120⋅ 121, and 122, and of those only 121 is a perfect square. Therefore the answer is120!·121!.反馈 收藏 ...
4.A square room has an area of 64 square feet. What is the length of a carpet needed to cover the floor of this room perfectly? 6feet 8feet 12feet 16feet 5.A square football pitch has a perimeter of400meters. What is the area of this pitch?
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