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efectuati utilizind formele calculului prescurtat a) (2-3a)(2+3a)
b) (4m+n)2
varog ajutatima


Răspuns :

(2-3a)(2+3a)=2²-(3a)²=4-9a²
(4m+n)2=8m+2n
Spor la lucru in continuare!

2²-(3a)²=4-9a²

(4m+n)²=(4m)²+2*4m*n+n²=16m²+8mn+n²