[計量] 請問幾題數學
1. N is the sim of the first K consecutive positive intergers, where
101<=K<=150 what is the sum of 1/N?
Ans. 2*(1/101 - 1/150)
我有算到1/N=2(1/K - 1/(K+1))
但不知道怎麼算到答案
2. X^2+X-6<0 問X=?
(1)X是自然數
(2)-2<X<2
Ans.A
(1) 我有算到X的範圍是-3<X<2 但即便X是自然數 還是可能是-2 -1 0 1
不懂為什麼選A
3. If n=q/p and both of p and q are non-zero integers, is n and integer?
(1)n^2 is an integer
(2)n^3 is and integer
Ans.D
這題我整個不知道要從哪裡想起
4. f(n)=2^x * 3^y * 5^z, x y z 分別是整數n的百位數、十位和個位。
f(m)=8f(h), m-h=?
Ans. 20
5. {x}denotes the greatest integer less than or equal to x. is {x}=1?
(1)x>1
(2)x<2
Ans.C
以上 拜託大家教教我囉!!
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