OLHA , URGENTE,E PARA AMANHA AJUDE - ME PLEASE   1)Quais equações são do 2° grau? a)x+5x²=2                       e)-x²+18=5+4x²   b)5-3x=x²                       f)3x+16=12-x   c)10x+40=7                   g)x²+3=5x²+1     d)7/2x+1=21x                h)3x³+2x=0
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