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Varianta 3 ,toate ex. rezolvate va rog

Varianta 3 Toate Ex Rezolvate Va Rog class=

Răspuns :

Răspuns:

1.a) 2,(3) = (23-2)/9 = 21/9 = 7/3

b) (7+11)/2 = 18/2 =9

2. a) 4/rad.2 = 4rad.2/ (rad.2 × rad.2) = 4 rad.2 / 2 =

. =2rad.2

b) 3rad5 □ 2rad.11

<=> rad(3²×5) □ rad(2²×11)

<=> rad45 □ rad 44

<=> 45 > 44 ==> 3rad5 > 2rad11

3. l = 3/4×L = 3×12/4 = 9cm

a) P = 12 ×2 + 9× 2 = 24+18 = 42cm

b) A = L×l = 12×9 = 108cm