help !!thanks a lot!!

janep78

[(400^300+200^600)/2]^4=400^k ,k=?

3的x次方+1能被10整除吗?
1.十位是个位的因子 1.个位是2

There are 1200 respondents to a poll,each favoring their preference for candidates A,B and C,54% favored A,48% favored B,and 42% favored C,and there is  30% favored both A and B,what's largest possible number respondants favoring  C,but not C&B,norC&A??

A班与B班P+q的人的median和mean哪个大?
1)P+q=79
2 p=24 q=55

共150人,其中60%有a.50%有b.30%有c.非a非b非c=5,且,求有且只有2种的总共多少.

janep78

200^600=200^(2*300)=400^300
????
200^600=(200^2)^300=400^300????