Question

calcule o valor da expressão: - 0,3 - 1/4 + 3/5

Answer 1

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$-0,3- \frac{1}{4} + \frac{3}{5} = \\ \\ - \frac{3}{10} - \frac{1}{4} + \frac{3}{5} = \\ \\ mmc(10,4,5)=20 \\ \\- \frac{6}{20} - \frac{5}{20} + \frac{12}{20} =- \frac{11}{20} + \frac{12}{20} = \frac{1}{20}$