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Efectuati
1) (X-1)²
2) (1-x)²
3) (7a-1,1b²)²
4) (√11-t³)²
5) (A²b-ab)²
6) (√5-2√2t


Răspuns :

1) (x-1 )^2 = x^2 -2•x•1+1^2