兩個不同的自然數倒數和是1/5,兩個數是多少?

兩個不同的自然數倒數和是1/5,兩個數是多少?


設這兩個數為x,y則有:1/x+1/y=1/5(x+y)/xy=1/5xy=5(x+y).說明左邊是5的倍數.令x+y=a,則有xy=5a.變形得到:x(a-x)=5a;x^2-ax+5a=0所以判別式=a^2-20a=a(a-20)為某數的完全平方,所以:a=36,進而得到:x=6,y=30.所以這…



一個自然數與它的倒數之和是5.2,這個自然數是______.


把5.2化成分數是515515=5+15,5×15=1;所以這個自然數是5.故答案為:5.



一個自然數和它的倒數的和是5.2,這個自然數是多少?
要列出式子要詳細的過程


5+1/5=5.2
這個自然數是5



一個自然數與它的倒數之和是5.2,這個自然數是______.


把5.2化成分數是515515=5+15,5×15=1;所以這個自然數是5.故答案為:5.



英語翻譯
it looks as if children were not better(off)in 2009 than they were in 2010
其中off怎麼理解請分析下


be better off是固定片語更好得意思Eventually,the argument ran,farmers and consumers would all be better off.該論點是,最終,消費者和農民都將過上更好的生活.Everybody would be better off if nobody traded…



英語翻譯
In some the axis of the shaft follows a circular path concentric with the walls of the mixing chamber at the same time as the stirrer rotates.


當攪拌漿旋轉時,軸的中心線會沿著圓形運動,並與預燃室的壁保持同軸.
雄鷹展翅英語團為您奉上!



英文數位翻譯1 2 3 4 5 6 7 8 9 10


1 one
2 two
3 three
4 four
5 five
6 six
7 seven
8 eight
9 nine
10 ten



7:15,8:05,9:30,10:50,3:45,1:55分別用兩種方式英語翻譯


seven fifteen a puarter past seveneight five five past eightnine thirteen half past nineten fifty ten to fivethree forty-five a puarter to fourone fifty-five five to two



2:15、3:30、4:45、5:55、6:13、7:22、8:35、9:47、10:52英文怎麼寫,急用,


2:15 Two fifteen或者fifteen past two
3:30 Three thirty或者half past three
4:45 Four forty-five或者a quater to five
5:55 five to six
6:13 six thirteen
7:22 seven twenty-two
8:35 eight thirty-five
9:47 nine forty-seven
10:52 eight to eleven



你的生日是什麼時候?是10.21.(用英語翻譯、)


When is your birthday?
October the twenty-second.