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Homework Statement
a,b,c,d in a ordered set K and b and d>0
Show that [tex]\frac{a+c}{b+d}[/tex] stay between the minimum and max from [tex]\frac {a}{b}[/tex] and [tex]\frac {c}{d}[/tex]. Generalize for [tex]a_1,\hdots,a_n,b_1,\hdots,b_n \in K[/tex] with [tex]b_1\hdots,b_n >0[/tex] so [tex]\frac{a_1+\hdots+a_n}{b_1+\hdots+b_n}[/tex] is between the max and min elements from [tex]\frac{a_1}{b_1},\hdots,\frac{a_n}{b_n}[/tex]
I could do it for the the first case but in a way it's impossible to generalize
any ideas?
tks in advance
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