Question

Calculati scotand factor comun:a)7•5-7•3= b)2 •3+3•8-3= c)15+15•7= d)7•9-7= e)143•81+143•11+143•7+143=

Answer 1

a) 7(5-3)=7*2=14
b) 3(2+8-1)=3*9=27
c) 15(1+7)=15*8=120
d) 7(9-1)=7*8=56
e) 143(81+11+7+1)=143*100=14300

Answer 2

a)5*7=30
3*7=21
30-21=11
b)2*3=6
3*8=24
6+24=30
30-3=27
c)15+15=30
30*7=210
d)7*9=63
63-7=56
e)143*81=11583
143*11=1573
143*7=1001
11583+1573+1001=14157
14157+143=14300