giup minh nhe

N

nhocboy1998

goi 5 so do la a,b,c,d,e
ta co:a+b>0;b+c>0;c+d>0;d+e>0;e+a>0
<=> a+b+b+c+c+d+d+e+e+a>0
<=> 2(a+b+c+d+e)>0
<=>a+b+c+d+e>0 mau thuan voi de bai
vay ko ton tai 5 so thoa man de bai
 
You must log in or register to reply here.
Top Bottom