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) -
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(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