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a fost răspuns

1. Se stie ca a+b+c=7 . Calculati :

a) 2a+2b+2c

b) 10a+10b+10c

c) a*13+b*13+c*13+21

Răspuns :

a+b+c=7
a)2a+2b+2c=
2x(a+b+c)=2x7=14
b)10a+10b+10c=
10x(a+b+c)=10x7=70
c)ax13+bx13+cx13+21=
(a+b+c)x13+21=
7x13+21=112