Răspuns:
1, a 2594, b. 1667 c.36270, d. 1892, 2. 4, 3. a. A, b. A, c. F, d. A, 4 . 2×(39÷(16-3)+(9+2)×7= 2×(39÷13+11×7)=2×(3+77)=2×80=160, 5. 439×2=878, b. 3/8, c. 3/4, 6. 5-4 cu una mai putin Ion decat ștefan. (a +(a+1))×x =72, stim ca a e 4, deci 9×x = 72, x =72÷9=8 , deci Ion rezolva 8×4=32 si Stefan 8x5=40.
