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12*13=
54*5=
123*4=
Jak rozpisac te działania ​


Odpowiedź :

12 * 13 = (10 + 2) * 13 =

= 10 * 13 + 2 * 13 = 130 + 26 = 156

54 * 5 = (50 + 4) * 5 =

= 50 * 5 + 4 * 5 = 250 + 20 = 270

123 * 4 = (120 + 3) * 4 =

= 120 * 4 + 3 * 4 = 480 + 12 = 492