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3 is the second and only prime triangular number, and Gauss proved that every integer is the sum of at most 3 triangular numbers. Three is the only prime which is one less than a perfect square . Any other number which is n 2 {\displaystyle n^{2}} − 1 for some integer n {\displaystyle n} is not prime, since it is ( n {\displaystyle n} − 1 ...
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3是循環單位111（連續3個1，其中3是質數）的因數，111=3 × 37; 幾何. 三個不共線點可定出一個平面或一個圓。 一個多邊形最少有三條邊; 只有3種正多邊形能密鋪平面：正三角形、正方形、正六邊形; 基本运算
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Oct 8, 2023 · 3是2與4之間的自然數，同時也是奇數、正整數。是從0開始的第二個質數，3是第三個非零自然數，也是第一個梅森素數。3的英文為three。3的二進制=11
3是循環單位111（連續3個1，其中3是質數）的因數，111=3 × 37; 幾何 [編輯] 三個不共線點可定出一個平面或一個圓。 一個多邊形最少有三條邊; 只有3種正多邊形能密鋪平面：正三角形、正方形、正六邊形; 基本運算 [編輯]
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noun [ C ] us / θriː / uk / θriː /. in basketball, a successful shot taken from behind the three-point line (= a curved line that goes around the basket from one side of the playing area to the other) and that is worth three points: He shoots threes better than anyone on his team. More examples.
3是2与4之间的自然数，同时也是奇数、正整数。是从0开始的第二个质数，3是第三个非零自然数，也是第一个梅森素数。3的英文为three。3的二进制=11
uk/θriː/us/θriː/. Add to word listAdd to word list. A1. the number 3. （數字）三. I've got three sisters.我有三個姐妹。. School finishes at three (o'clock).學校在三點鐘放學。. 减少例句. The painting depicts the three wise men kneeling in adoration of the baby Jesus.
