Web600+评价. PVC排水管内插管帽封口75塞盖帽堵头50下水管堵盖子110堵帽内堵盖. ￥. 3.24. 已售700+件. 4.9. 1000+评价. PVC排水管内插管帽50配件封口盖帽密封塞75堵头下水管 … WebIn mathematics. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 1 2 + 7 2 = 5 2 + 5 2. It is also the sum of three squares, 50 = 3 2 + 4 2 + 5 2, and the sum of four squares, 50 = 6 2 + 3 2 + 2 2 + 1 2.It is a Harshad number.. 50 is a Stirling number of the first kind: [] = and also a Narayana number: ⁡ (,) = ⁡ …

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50 (number) - Wikipedia

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