Question

a) 3 + \(\frac{2}{5}\)=?        b) 4 - \(\frac{5}{7}\)           c) 1 - ( \(\frac{2}{5}+\frac{1}{3}\)) =?

Answer 1

a) \(3+\frac{2}{5}=\frac{3}{1}+\frac{2}{5}=\frac{15}{5}+\frac{2}{5}=\frac{17}{5}\)

b) \(4-\frac{5}{7}=\frac{4}{1}-\frac{5}{7}=\frac{4}{1}+\left(-\frac{5}{7}\right)=\frac{28}{7}+\left(-\frac{5}{7}\right)=\frac{23}{7}\)

c) \(1-\left(\frac{2}{5}+\frac{1}{3}\right)=\frac{1}{1}-\left(\frac{2}{5}+\frac{1}{3}\right)=\frac{1}{1}+\left(-\frac{11}{15}\right)=\frac{15}{15}+\left(-\frac{11}{15}\right)=\frac{4}{15}\)

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