Răspuns :
5 x 3 + 5 x 9 = 5 x ( 3+9)
= 5 x 12
= 60
6 x2 + 6 x 7 = 6 x ( 2 +7)
= 6 x 9
= 54
sau :
5 x 3 + 5 x 9 = 15 + 45
= 60
6 x 2 + 6 x7 = 12 + 42
= 54.
= 5 x 12
= 60
6 x2 + 6 x 7 = 6 x ( 2 +7)
= 6 x 9
= 54
sau :
5 x 3 + 5 x 9 = 15 + 45
= 60
6 x 2 + 6 x7 = 12 + 42
= 54.