a math question from Lisa
Hey there
I am new here , so don't know how to deal with some of the function but anyway I like this site quite well ....
here is one maths pro that puzzled me , in fact, many maths pros confuss me ......
need your kindly help thank you ^^
from Lisa in SH
3、x,y,k>0 ,( x/(x+y))^10 + ( y/(x+y) )^20 = k ， x【讨论】
N：附上老机经：
已知正整数x y k, x答案：18 （15< <20）
R：式子=(10x+20y)/(x+y)=10+10/(x/y+1)=k,因为0 |
