Question

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

urgent​

Answer 1

Răspuns:

14x5=(10x5)+(4x5)=50+20=70

13x6=(10x6)+(3x6)=60+18=78

72x3=(70x3)+(2x3)=210+6=216

16x4=(10x4)+(6x4)=40+24=64

34x8=(30x8)+(4x8)=240+32=272

28x2=(20x2)+(8x2)=40+16=56

19x9=(10x9)+(9x9)=90+81=171

5x68=(5x60)+(5x8)=300+40=340

9x75=(9x70)+(9X5)=630+45=675