JJ

loulan

I'm sorry I don't remeber more

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]

tongxun

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

loulan

you are right, it is :3^(2x) = 8100, 3^(x-1)=?, you answer is right.