Question

12. Efectuează, după model: 12 * 7 = (10 x 7) + (2 x 7) = 70 + 14 = 84 14 x 5 13 x 6 16 x4 34 x 8 19 x9 5 x 68 72 x 3 28 x 2 9 x 75​

Answer 1

Răspuns:

14×5= (10×5)+(4×5)=50+20=70

16×4= (10×4)+(6×4)=40+24=64

19×9= (10×9)+(9×9)=90+81=171

13×6= (10×6)+(3×6)=60+18=78

34×8= (30×8)+(4×8)=240+32=272

5×68= (60×5)+(8×5)=300+40=340

72×3= (70×3)+(2×3)=210+6=216

28×2= (20×2)+(8×2)=40+16=56

9×75= (70×9)+(5×9)=630+45=675