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Alflati pe a

a - 84 <1


a + 89 < 91


Răspuns :

a-84<1
a<84+1
a<85
a=84

A+89<91
a<91-89
a<2
a=0,1
[tex]a-84\ \textless \ 1 \\ a\ \textless \ 1+84 \\ a\ \textless \ 85 [/tex]
x apartine (-infinit, 85)

[tex]a+89\ \textless \ 91 \\ a\ \textless \ 91-89 \\ a\ \textless \ 2 [/tex]
x apartine (-infinit, 2)