大家帮忙做做这几道数学题

IORIYAGAMI

1. Is xy>xsquare*ysquare

   a)14*xsquare=3

   b)ysquare=1

Answer is E. 但我觉得是C

2 If an interger n is to be chosen at random from the intergers 1to 96, what is the probability that n(n+1)(n+2) will be divisible by 8?

Answer is 5/8.

3. At a certain company, each employee has a salary grade s that is at least 1 and at most 5. Each employee receives an hourly p, in dollars, determined by the formula p=9.5+0.25(s-1). An employee with a salary grade of 5 receives how much more dollars per hour than an employee with a salary grade of 1?

Answer is $1.25. 但我算了好几次觉得是$1.

谢谢了.

knight9514

QUOTE:

1. Is xy>xsquare*ysquare

   a)14*xsquare=3

   b)ysquare=1

Answer is E. 但我觉得是C

y=-1，x为正的时候不可以，所以是E

2 If an interger n is to be chosen at random from the intergers 1to 96, what is the probability that n(n+1)(n+2) will be divisible by 8?

Answer is 5/8.

当n为偶数或者是n为奇数但是n+1是8的倍数的时候成立（在网吧，没有草纸，不好意思没法写过程）

3. At a certain company, each employee has a salary grade s that is at least 1 and at most 5. Each employee receives an hourly p, in dollars, determined by the formula p=9.5+0.25(s-1). An employee with a salary grade of 5 receives how much more dollars per hour than an employee with a salary grade of 1?

Answer is $1.25. 但我算了好几次觉得是$1.

P1=9.5

P5=9.5+1

应该是1

GWD上有不少答案是错的

谢谢了.

IORIYAGAMI

GWD4. Q7. 我还没明白,

1. Is xy>xsquare*ysquare

   a)14*xsquare=3

   b)ysquare=1

Answer is E. 但我觉得是C

y=-1，x为正的时候不可以，所以是E

我认为无论x,y取正或负时,结果xy总 < x的平方*y的平方.所以还是选C.

谢谢