1到31的序数词

1st first
2nd second
3rd third
4th fourth
5th fifth
6th sixth
7th seventh
8th eighth
9th ninth
10th tenth
11th eleventh
12th twelveth
13th thirteenth
14th fourteenth
15th fifteenth
16th sixteenth
17th seventeenth
18th eighteenth
19th ninteenth
20th twentieth
21st twenty-first
22nd twenty-second
23rd twenty-third
24th twenty fourth
25th twenty-fifth
26th twenty-sixth
27th twenty-seventh
28th twenty-eighth
29th twenty-ninth
30th thirtieth
31st thirty-first

基数词：1 one 2 two 3 three 4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten 11 eleven 12 twelve 13 thirteen 14 fourteen 15 fifteen 16 sixteen 17 seventeen 18 eighteen 19 nineteen 20 twenty 21 twenty-one 22 twenty-two 23 twenty-three 24 twenty-four 25 twenty-five 26 twenty-six 27 twenty-seven 28 twenty-eight 29 twenty-nine 30 thirty 31 thirty-one

　1 first
　　2 second
　　3 third
　　4 fourth
　　5 fifth
　　6 sixth
　　7 seventh
　　8 eighth
　　9 ninth
　　10 tenth
　　11 eleventh
　　12 twelfth
　　13 thirteenth
　　14 fourteenth
　　15 fifteenth
　　16 sixteenth
　　17 seventeenth
　　18 eighteenth
　　19 nineteenth
　　20 twentieth
　　30 thirtieth
P.S.
21 twentieth-first
32 thirty-second

22^2=484
23^2=529
24^2=576
25^2=625
26^2=676
27^2=729
28^2=784
29^2=841
30^2=900
31^2=961

平均25
每2个和为50
所以配对
31 19
30 20
29 21
28 22
27 23
26 24
在上述组中任选二组都可以

first (1st) 第一
second (2nd) 第二
third (3rd) 第三
fourth (4th) 第四
fifth (5th) 第五
sixth (6th) 第六
seventh (7th) 第七
eighth (8th) 第八
ninth (9th) 第九

tenth (10th) 第十

eleventh (11th) 第十一

twelfth (12th) 第十二
thirteenth (13th) 第十三

fourteenth (14th) 第十四
fifteenth (15th) 第十五
sixteenth (16th) 第十六
seventeenth (17th) 第十七
eighteenth (18th) 第十八
nineteenth (19th) 第十九
twentieth (20th) 第二十

twenty-first (21st)第二十一
twenty-second dierer(22nd)第二十二

twenty-third (23rd) 第二十三
twenty-fourth (24th)第二十四

twenty-fifth (25th)第二十五
twenty-sixth (26th) 第二十六

twenty-seventh(27th) 第二十七
twenty-eighth(28th)第二十八

twenty-ninth (29th)第二十九
thirtieth (30th) 第三十

thirty=first (31st) 第三十一
希望我的回答能够帮助你,谢谢!

one
two
three
four
five
six
seven
eight
nine
ten
eleven
twelve
thirteen
fourteen
fifteen
sixteen
seventeen
eighteen
nineteen
twenty
twenty-one
twenty-two
twenty-three
twenty-four
twenty-five
twenty-six
twenty-seven
twenty-eight
twenty-nine
thirty
thirty-one

1到31的基数与序数英语单词?one first two second three third four fourth five fifth six sixth seven seventh eight eighth nine ninth ten tenth eleven eleventh twelve twelfth thirteen thirteenth fourteen fourteenth fifteen fifteenth sixteen sixteenth seventeen seventeenth eighteen eighteenth nineteen nineteenth twenty twentieth twenty-one twenty-first twenty-two twenty-second twenty-three twenty-third twenty-four twenty-fourth twenty-five twenty-fifth twenty-six twenty-sixth twenty-seven twenty-seventh twenty-eight twenty-eighth twenty-nine twenty-ninth thirty thirtieth

3、6、9、12、15、18、21、24、27、30；4、8、12、16、20、24、28；6、12、18、24、30；12、24；相邻两个自然数,他们的公倍数是两个数的积的倍数.

first第一
second第二
third第三
fourth第四
fifth第五
sixth第六
seventh第七
eighth第八
ninth第九
tenth第十
eleventh第十一
twelfth第十二
thirteenth第十三
fourteenth第十四
fifteent...

对的,first,second,third,但是有些要去y加ieth 如twentieth 还有的就要变fifth

first second thirt

第1 first 1st 第2 second 2nd 第3 third 3rd 第4 fourth 4th 第5 fifth 5th 第6 sixth 6th 第7 seventh 7th 第8 eighth 8th 第9 ninth 9th 第10 tenth 10th 第11 eleventh 11th 第12 twelfth 12th 第13 thirteenth 13th 第14 four...

first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth thirteenth fifteenth seventeenth nineteenth twenty- first twenty-third twenty-second twenty-fifth twenty-sixth twenty-eighth thirtieth thirtieth-first 我只能帮助你这些