GWD11-33,37

[Martina]

Q33:
A store’s selling price of $2,240 for a certain computer would yield a profit of 40 percent of the store’s cost for the computer. What selling price would yield a profit of 50 percent of the computer’s cost?

A. $2,400
B. $2,464
C. $2,650
D. $2,732
E. $2,800

Q37:
If x < 0 and 0 < y < 1, which of the following has the greatest value?

A. x2
B. (xy)2
C. ( X/Y)2
D. X2/Y
E. x2y

答案分別是A,C
可是我算是E, A
幫我看看是我錯ㄌ還是答案錯ㄌ ????

[homaru]

http://www.formosamba.com/phpBB3/viewtopic.php?t=2358

[huacy]

請依照版規 一篇一題 這樣版主比較好整理文章
還有請多利用上下標的功能 不然也以^取代次方 ex: 2^3

Q33.
假設電腦的價值為x, (2240-x)/x=0.4, x=1600
如果店家要賺到50% => 1600*1.5=2400

Q.37
0<y<1 所以乘以y會比原來的值小, 除以y會比原本的值大
x[sup]2[/sup]y[sup]2[/sup]<x[sup]2[/sup]y<x[sup]2[/sup]<x[sup]2[/sup]/y<(x/y)[sup]2[/sup]