12.5 1200pm jj【楼下陆续有狗】

kmylv · 发表于 2011-12-6 16:47:59

xyz are different prime numbers larger than 1, abc are positive integers, ask if x^a*y^b*z^c>[forgot the number.]
1)x+y+z=5
2) forgot...
chose both

是不是这个啊 pnr are different 求integers p^x*n^y*r^z=
条件1 x+y+z=5 条件2 pnr=30

xciverz · 发表于 2011-12-6 17:41:33

an airplane company(?), fly between n cities, 2 non stop flight per day, ask how many flights during the day(?)
2n(n-1)

楼主这个题是怎么算的啊？

graceleo90 · 发表于 2011-12-6 20:31:51

那个梯形是等腰吗？

graceleo90 · 发表于 2011-12-6 20:45:56

an airplane company(?), fly between n cities, 2 non stop flight per day, ask how many flights during the day(?)
2n(n-1)

楼主这个题是怎么算的啊？

-- by 会员 xciverz (2011/12/6 17:41:33)

2*An2

epanama · 发表于 2011-12-6 23:34:43

是的！

kmylv · 发表于 2011-12-7 18:22:21

Lz说哪个是的啊？

夏子之酒 · 发表于 2011-12-8 07:26:29

xyz are different prime numbers larger than 1, abc are positive integers, ask if x^a*y^b*z^c>[forgot the number.]
1)x+y+z=5
2) forgot...
chose both

-- by 会员 epanama (2011/12/6 0:30:44)

[/quote]

楼主能不能确认下题目阿。。。我选不了both 阿求指教！！！
114、【epanama】xyz are different prime numbers largerthan 1, abc are positive integers, ask if x^a*y^b*z^c>[forgot the number.]

1)xyz=30
2) a+b+c=5
chose both
思路：different prime numbers larger than 1 :for exemple , choose 2, 3,5 ,their sum is 30. So the possibility of x,y,zis ( 2,3,5)
the same reasonthe possibility of a,b,c is ( 1,1,3) or( 2,2,1)
so the rang of x^a*y^b*z^c is (120, 750)

[原始] 12.5 1200pm jj【楼下陆续有狗】

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