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Efectuati folosind formulele de calcul prescurtat:(3x-1)la patrat

Răspuns :

(3x-1)²=

(3x)²-2•3x+1=

3²x²-2•3x+1=

9x²-6x+1

(3x-1)²= 3x²- 2•3x•1+ 1²= 9x²- 6x+ 1