3*2x=8100, 3*(x-1)=?
(Oct.03)
Now I know, but too late. I feel math's questions are difficult than what I practised. I met few JJ. All 4 rc are new. I got a poor score, but I don't want to try again. I come here to say thank you for all, especially tongxun. I often saw tongxun working here, you did a good job. [em01]
[此贴子已经被作者于2002-10-5 0:51:18编辑过]
作者: tongxun 时间: 2002-10-5 00:56
It is only a test,and many people retake it for several times to get a better score. you can find examples in origion jijing.
just prepare for the next test!!!
The jijing you list is not a difficult one. X=1350, 3*(x-1)=3*1349
probably it is :3^(2x) = 8100, 3^(x-1)=?
(3^x)^2=8100, 3^x=90, 3^(x-1)=(3^x)/3, 90/3=30作者: loulan 时间: 2002-10-5 09:59
you are right, it is :3^(2x) = 8100, 3^(x-1)=?, you answer is right.
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