Question

5. Calculează, respectând ordinea efectuării operaţiilor: (3x5-3x4)+ (3x5-5x3)= 4 x (5-4+3) +3 x (9-4+2)+4 x(1+2+4) = = (18+2- 15 ) x 9 +129- (9 x 2) -​

Answer 1

(3x5-3x4)+(3x5x3)

(15-12)+(15x3)

(15-12)+45

3+45=48

4x(5-4+3)+3x(9-4+2)+4x(1+2+4)

4x(1+3)+3x(5+2)+4x(3+4)

4x4+3x7+4x7

16+21+28

37+28=65

(18+2-15)x9+129-(9x2)

(18+2-15)x9+129-18

(20-15)x9+129-18

5x9+129-18

45+129-18

174-18=156