GWD -8 两道数学题求解多谢

The annual rent collected by a corporation from a certain building was percent more in 1998 than in 1997 and percent less in 1999 than in 1998. Was the annual rent collected by the corporation from the building more in 1999 than in 1997?(1) > (2) < – If an integer is to be chosen at random from the integers 1 to 96, inclusive, what is the probability that ( + 1)( + 2) will be divisible by 8? 答案有1/4 3/8 1/2 5/8 3/4 我算出的是八分之一 ⊙﹏⊙b汗The annual rent collected by a corporation from a certain building was percent more in 1998 than in 1997 and percent less in 1999 than in 1998. Was the annual rent collected by the corporation from the building more in 1999 than in 1997?(1) > (2) xy/100 < –

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1.只有8的倍数才能被8除尽.因此n（n+1）（n+2）必然是8的倍数.因此n有96/8=12种,同理,n+1和n+2分别有12种.所以总共为12*3=36种.36/96=3/8 选B2.设1997为1,1998年则为1+x%,1999年为（1-y%)(1+x%)题目是要比较1999与19...

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