Question

240. Efectueaza inmultirile, scruind unul dintre factori ca o sumă, dupa modelul dat
MODEL
16x5= (10 + 6) * 5 = 10 x 5+ 6 x 5 = 50 + 30 = 80
a) 17 x 5
19 x 5
b) 13 x 6
19 x 6
c)129
18 x 9
d) 14 x 7
16x7
e) 3 x 15
3*17​

Answer 1

Răspuns:

a) 17x5=(10+7)x5=10x5+7x5=50+35=85

19x5=(10+9)x5=10x5+9x5=50+45=95

b)13x6=13x(2+4)=13x2+13x4=26+52=78

Answer 2

Rezolvarea este in poza