1到39英文怎么写,打1到39的英文给我!

lilac8222022-10-04 11:39:547条回答

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30.thirty
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39.thirty-nine

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1到39之间所有奇数的平方和是多少？要求简便方法算出来 1到39之间所有奇数的平方和是多少？要求简便方法算出来 这是小学的奥林匹克题目，肯定不是用死方法算出来的，哪位高人告诉我最简单的算法呢？ 木虚地1年前1: l161616 共回答了20个问题 | 采纳率100%

公式：
1^2+3^2+5^2+..........(2n-1)^2=n(4n^2-1)/3
1到39之间有奇数20个，n=20
1到39之间所有奇数的平方和=20*（4*20^2-1）/3=10660

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1到39这些自然数中的所有数字之和是 veinay1年前2: Daniel7 共回答了12个问题 | 采纳率91.7%

1+2+3+.+37+38+39
=（1+39）*39/2
=20*39
=780

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1到39的数字单词怎么写? bratiger1年前1: alihaolei 共回答了24个问题 | 采纳率87.5%

1到39的数字单词怎么写?

你是要英文单词吗?
那就是:
one 1
two 2
three 3
four 4
five 5
six 6
seven 7
eight 8
nine 9
ten 10
eleven 11
twelve 12
thirteen 13
fourteen 14
fifteen 15
sixteen 16
seventeen 17
eighteen 18
nineteen 19
twenty 20
twenty-one 21
twenty-two 22
twenty-three 23
twenty-four 24
twenty-five 25
twenty-six 26
twenty-seven 27
twenty-eight 28
twenty-nine 29
thirty 30
thirty-on 31e
thirty-two 32
thirty-three 33
thirty-four 34
thirty-five 35
thirty-six 36
thirty-seven 37
thirty-eight 38
thirty-nine 39

希望可以帮到你.

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