Assinale as equações que são do 2 grau em uma incógnita:
a) ( ) 4x²+3x+4=0
b) ( ) 4x-3=0
c) ( ) 5x^4 -3x²+6=0
d) ( ) 0y²+3y-25=0
e) ( ) 2x²-2x+2=0

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