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Determinati valoarea maxima a expresiilor:
a)-x^2+12x-30
b) -a^2+1/2a+3/16
c) -a^2+10a-20
d)-x^2-14x-40
e)-y^2+2y
f)-x^2-2x-y^2+2y+10
^2 inseamna la puterea a doua
Va rog rezolvarile complete