几道也许对于大家不算很难的数学问题，请教

kennu_r

不知道我是不是说的太罗嗦了呵呵

-- by 会员 nicolekwok (2010/6/19 15:34:00)

不会的，相当清楚，谢谢！

zwjb828

The fourth question, I think it is B.
The product of the first 8 +ve intengers= 1*2*3*...*8=2^7*3^2*5*7
Condition  1) a^n=64. a may equal 4 or 2. (x)
Condition  2) n=6. a could only be 2.

By the way, question 3.

For the condition1), no matter it represents + or *, the problem could be solved, i.e., the equation is valid.
However, the condition 2) could not confirm whether the equation is valid. (* is valid, while / is not.) the question could not be solved.

That's why we choose A.