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Completati,astfel incit propozitia obtinuta sa fie adevarata: a) (? - t^2)(? + t^2)=64z^2-t^4. b) (√3a - b)(? + b)=3a^2 - b^2. c) (1/2a - ?)(1/2a + ?)=?-25b^4. d) (0,3y + 2x)(? - ?)=0,09y^2-4x^2

Răspuns :

a) (8z-t^2)(8z+t^2)=64z^2-t^4
b) (√3a-b)(√3a+b)=3a^2-b^2
c) (1/2a-5b^2)(1/2a+5b^2)*aici numai b e ridicat la a2a)
d) (0.3y+2x)(0.3y-2x)=0.09y+4x^2