Question

Se stie ca a+b+c=7.Calculati:
a)2a+2b+2c=
b)10a+10b+10c=
c)ax13+bx13+cx13+21=
d)8a+8b+8c-12=
e)400-(5a+5b+5c)=
f)6a+6b+6c+100=






Se stie ca ca a+b+c=23 si x=9.Calculati:
a)14xa+14xb+14xc+14x X=
b)2013-(53xa+53xb+53xc+10x X)=
c)349+6xa+6xb+6xc-12x X=
d)424-21x X+3xa+3xb+3xc=
e)7xa+7xb+7xc-10x X=
f)3147-10x X-(100xa+100xb+100xc).

Answer 1

pt prima parte;dai factor comun si tii cont ca a+b+c=7

a)2(a+b+c)=2*7=14
b)10a+10b+10c=10(a+b+c)=10*7=70
c)ax13+bx13+cx13+21=13x(a+b+c)+21=13*7+21=112
d)8a+8b+8c-12=8(a+b+c)-12=8*7-12=44
e)400-(5a+5b+5c)=400-5(a+b+c)=400-35=365
f)6a+6b+6c+100=6(a+b+c)+100=6*7+100=142