Question

1.Calculaţi, scoţând factor comun:
Exemplu : 2·5 – 2·3= 2∙(5-3)=2∙4=4
a) 7·5 – 7·3=....................................................
b) 2·3+3·8 – 3=…………………………………
c) 15+15·7=………………………………………
d) 7·9 – 7=……………………………………………
e) 143 ·8+143·11+143·7 +143=……………………………..
Va rog

Answer 1

Răspuns:

a) 7×(5-3)= 7×2=14

b) 3×(2+8-1)= 3×9=27

c) 15× (7+1)=15×8=120

dl 7×(9-1)=7×8=56

e) 143×(8+11+7+1)=143×26=3.718