Maths既Quiz呀

d) Divide the sixth even number by the sum of the first 5 prime numbers.
The sixth even number=6*2=12
The sum of the first 5 prime numbers=3+5+7+11+13=39
Answer=12/39=4/13
e) Subtract one-quarter of 64 from 12
One-quarter of 64=64*1/4=16
Answer=16-12=4
f) Twice the fourth odd numbers.
The fourth odd number=7
Answer=7*2=14

1d.

10/(2+3+5+7+11)
5/14

e.

12-(64/4)
-4

f.
2*7
14

2008-09-16 19:23:18 補充：
1d wrong sor

1d.
12/(2+3+5+7+11)
3/7

d) 12
-------------
2+3+5+7+11

3
=------
7

f) 7^2

=49

e) 唔明