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Scoate factorul comun:
a) 2×a+2×b+2×c
b) 5×x+5×y-5×z
c) 7×a+7×b+49
d) 3×x-3×y+3


Răspuns :

2a+2b+2c=2(a+b+c)
5x+5y-5z=5(x+y-z)
7a+7b+49=7(a+b+7)
3x-3y+3=3(x-y+1)