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Daca 1 < a < 4 si 3 < b < 5, atunci, varianta corecta este........
a) 1 < ab < 5 b) 3 < ab < 20
c) 2 > ab > -20 d) 1 < ab < 16


Răspuns :

[tex]1\ \textless \ a\ \textless \ 4 \\ 3\ \textless \ b\ \textless \ 5 [/tex]
[tex]1*3\ \textless \ a*b\ \textless \ 4*5[/tex] ⇒ [tex]3\ \textless \ ab\ \textless \ 20(b)[/tex]
a ={2,3} b={4} atunci varianta: a) 1<24<5. Fals. b)3<24<20. Fals. c)2>24>-20. Fals. d)1<24<16. Fals. !!!!!!!! ACEST EXERCITIU ESTE ERONAT !!!!!!!