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scoate factor comun a) 2•a +2•b+2•c b) 5•x+5•y-5•z

Răspuns :

a) 2×a+2×b+2×c=
2×(a+b+c)

b) 5×x+5×y+5×z=
5×(x+y-z)
a) 2(a+b+c)
B) 5(x+y-z)