1
The sum of two numbers, x and y, equals twice their products. if x=3, what is the value of y?
这道题没大看懂?请问大家是这样么?
x+y=2xy,求y.
2
If x is an integer and x2(x的平方)<37,what is the greatest possible value of x minus the least possible value of x?
我觉得这道题x的最大值为6,最小值为0,所以选6.
a.5 b.6 c.10 d.12 e.36
选D，最大为6，最小为-6.
3
三角形ABC，角B=X度，X>90 度，比较三角形的周长与3倍AC的长度的大小，答案是B
AC是最大边,所以AB+BC+AC
2.0
比较the greatest value of p(1-p)与1/2的大小，答案是C
答案错了,选B p+(1-p)>=2p(1-p)^1/2 => p(1-p)<=1/4 <1/2
4
For the line with equation y=ax+b,the x-intercept os twice the y-intercept
比较the slope of the line 与1/2的大小，答案是D，但算出来是-1/2呀
还有截距为零的情况,所以D.
5
A certain moneymarket account that had a balance of $48000 during all of last monthearned $360 in interest for the month. at what simple annual interestrate did the account earn interest last month?
答案是9%,题目没看懂
意思是一个货币市场上个月共结余48000，用它赚了360的利息，问以年单利计算每年利率是多少?
360*12/48000=9%
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