提问几道GRE绿皮数学题,急!本人数学不好,请详细解释,说明解题步骤,谢谢!P7.15misaninteger.Theremainderwhenm^3-misdividedby2与1比大小答案：后者大P8.29Mr.Smithgotan8percentcost-of-livingraiseof$20

Question

提问几道GRE绿皮数学题,急!
本人数学不好,请详细解释,说明解题步骤,谢谢!
P7.15
m is an integer. The remainder when m^3-m is divided by 2与1比大小 答案：后者大
P8.29
Mr. Smith got an 8 percent cost-of-living raise of $20 per week. Ms. Smith's new weekly salary与$260比大小 答案：前者大 这题什么意思啊?
P11.5
When x is divided by 25, the remainder is O. The remainder when x is divided by 5与O比大小 答案：一样大
P12.23
3(r/3+s/4+5/3)与r-s+5比大小 答案：一样大
P13.29
Mrs.Jones sold two houses for $80000 each. One house was sold at a 20 percent loss and the other at a 20 percent gain. The gain minus the loss与0比大小 答案：后者大
P14.45
1

Answer 1

第一题：m^3-m=m(m+1)(m-1) is even, so there should be no remainder after the division, therefore 1 should be bigger.
第二题：Mr.和Ms. Smith 我姑且当你是一个人,8 percent cost-of-living raise = $20/week, therefore the original salary should be 20/0.08=250, then the new salary will be 250+20=270>260
第三题：这题你都不会.没难度啊,x能被25整除,那被5除的remainder与0比较,肯定一样啊
第四题：个人觉得有问题,要不就是你抄题抄错了,3s/4 不可能和-s 一样大啊,应该选D吧
第五题：gain-loss=1/1.2*0.2-1/0.8*0.2=1/6-1/4