Question

2 Efectuează, după model. 12 x 7 = (10 x 7) + (2 x 7) = 70+ 14 = 84 14 x 5 13 x 6 72 × 3 16 x 4 34 x 8 28 × 2 19 x 95 x 68 pole 9×75​

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=(10×8)+(4×8)=80+32=112

5×68=(5×6)+(10×5)=30+50=80

28×2=(10×2)+(8×2)=20+16=36

9×75=(9×5)+(9×10)=45+90=135

Answer 2

Explicație pas cu pas:

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