Question

Calculeaza in scris si verifica dupa model. MODEL:
12×
14
-------
48+
12
------
168
12×14=12×(10+4)
=12×10+12×4
=120+48=168.

121×12,212×14,412×12,131×13

Answer 1

Răspuns:

121×12=121×(10+2)

121×10+121×12

1210+1452=2662

212×14=212×(10+4)

212×10+212×14

2120+2968=5088

412×12=(10+2)

412×10+412×12

4120+4944=9064

131×13=(10+3)

131×10+131×13

1310+1703=3013