求教ps。多谢！

深海的小美人鱼

27、W<0.6X,X<0.6Y,Z<0.54Y,求Z比W大百分制几？

橙子

小鱼,如果是Z<0.54Y,似乎不能得到确定答案

baldhead

w<0.36y
Z<.54y

I agree with Orange mm

terp

Don't get it either.

zida

From x<0.6y, => 0.6x<0.36y, which compares to w<0.6x, we have
w<0.36y, and we know z<0.54y. So,
3*w<0.36*3y, and 2*z<0.54*2y, we got
3w<1.08y, (1)
2z<1.08y, (2), so (1) divided by (2), we got
[(3w)/(2z)]<1, => 3w<2z, and
w<(2/3)z , Z比W大百分制66.67

深海的小美人鱼

答案是50%

我自己也怀疑题目有问题。

zida

little 鱼, I might made a mistake. Look, from 3w<2z, we can get z>(3/2)w. So
Suppose, w=1, then
z>3/2, and z-w=3/2 -1 =1/2
Which is 50%, don’t you think so?

zjw007

以下是引用zida在2004-2-10 9:56:00的发言：
From x<0.6y, => 0.6x<0.36y, which compares to w<0.6x, we have
w<0.36y, and we know z<0.54y. So,
3*w<0.36*3y, and 2*z<0.54*2y, we got
3w<1.08y, (1)
2z<1.08y, (2), so (1) divided by (2), we got
[(3w)/(2z)]<1, => 3w<2z, and
w<(2/3)z , Z比W大百分制66.67

Hi man, I think from (1), (2) we can not get 3w/2w <1, am i right?
I think we can not get answer for this question. pls discuss...

深海的小美人鱼

I think I got it.
求z比w大百分之几，其实是说，(z-w)/w
从条件可以得出z<0.54Y  w<0.36Y
so,  Z-w/w=0.18/0.36=50%

zida

以下是引用深海的小美人鱼在2004-2-12 12:43:00的发言：
I    think    I    got    it.
求z比w大百分之几，其实是说，(z-w)/w
从条件可以得出z<0.54Y        w<0.36Y
so,        Z-w/w=0.18/0.36=50%