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(b+2c) (-b-c) hai repede .mersi

Răspuns :

( b+ 2c )( -b-c ) =
= -b^2 - bc - 2bc - 2c^2 =
= -b^2 - 3bc - 2c^2
(b + 2c)(-b - c) =

= -b² - bc - 2bc - 2c²

= -b² - 3bc - 2c²