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Adevarat sau fals
a)4×^2-9×^2=(4×-9y)(4×+9y)
b)daca x+1/×=4,atunci ×^2+1/×^2=14
c)3/2×^2y^2+9/2×^3y^3=3/2×^2y^2(3xy+5×^2y^2)
Este urgent!