作者reideen107 (理想一直都在)
看板trans_math
标题[考古] 高大96年
时间Tue Jul 1 19:57:51 2008
3.The sum of two nonnegative numbers is 20. Find the numbers
(a)if the product of one number and the square root of the other is to be
as large as possible;
(b)if one number plus the square root of the other is to be as large as
possible.
我看不懂这题在说啥@@，请问要怎麻解？
4
6. (a) Evaluate ∫ log x /x dx.
1 2
(b) Solve the equation
dy
x— = x^2 + 3y
dx
given the initial condition y(1)=2
(a)题的log是要直接化成lnx/ln2去积吗？
(b)题不太懂......
题目都没答案，写完都不知道对不对@@
烦请各位高手相助~QQ
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