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(1+a+b) totul la a 2~a vrg plzzzzzzzzzzzz


Răspuns :

(1+a+b)²=
1²+a²+b²+2×1×a+2×a×b+2×1×b=
1+a²+b²+2a+2ab+2b
(1+a+b)(1+a+b)=1+a+b+a+a la 2+ab+b+ab+b la 2=
a la 2 +b la 2+2ab+2a+2b