Răspuns:
a) (2 x 3) + (2 x 5)=2×(3+5)=2×8= 16
(5 x 4) + (5 x 6) =5×(4+6)=5×10=50
(7 X 2) + (7 x 4) =7×(2+4)=7×6=42
(8 x 3) + (8 x 5) =8×(3+5)=8×8=64
b) (9x 7) - (9 x 4) =9×(7-4)=9×3=27
(7 x 5) - (7 x 3) =7×(5-3)=7×2=14
(6 x 9) - (6 x 4) =6×(9-4)=6×5=30
(8 x 7) - (8 x 4) =8×(7-4)=8×3=24
Explicație pas cu pas: