Scoate factor comun a)2*a+6+2*b+2*c;b)5*x+5*x+5*y-5*z;c)7*a+7*b+49;d)3*x-3*y+3.

Răspuns :

a)2*a+6+2*b+2*c=2x(6+b+c)
b)5*x+5*x+5*y-5*z=5x(x+x+y-z)
c)7*a+7*b+49=7xa-7xb+7x1=7x(a+b+1)
d)3*x-3*y+3=3xX-3xy+3x1=3x(x-y+1)