May 2021 2 48 Report
determine o dominio de validade e o conjunto verdade destas equações fracionarias redutiveis ao 2º grau:?

a)21/(5-x)x - 1/7 = 23/7x

b)x/x+1 + x/x+4 = 1

c)1 - 11x/x+1 = 1- 5x²/x² - 1

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