2 2 2
-5a + 2a -8a + 7a +18a - 6b - 11a +9b


Răspuns :

-5a + 2a -8a + 7a +18a - 6b - 11a +9b=
-5a+2a-8a+7a+18a-11a+9b-6b=
3a+3b=
3(a+b)
=3a+3b=3(a+b)
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Succes in continuare!