一些數學JJ

1. equilateral triangle 内接于一个圆内。Triangle的面积是9倍根号3。问你圆的面积是多大。

2. x=-1 n是前243個prime number的總和~問x+x^n+x^(n+1)+x^(n+2)  

3. S^6V^3T^7<0 (應該是這樣), 問SVT<0
a. v>0

b. t<0

4. (0.8)^-5/(0.4)-4= 

ANS:  5/64  <---GWD有寫

5. If a and b are intergers, is b even <---GWD

 a. 3a+4b is even

 b. 3a+5b is even

ANs: C

祝大家殺雞順利