|
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=2 x+y=2xy,求y. 2 if x is an integer and x237,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，X90 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与1/2的大小，答案是C 答案错了,选B p+=2p^1/2 ==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? | 
