Question

(-1 pe 90):(-1 pe 30)-(3 pe 5) la -1

Answer 1

$(- \frac{1}{90} ):(- \frac{1}{30} )-( \frac{3}{5} )^-^1=(- \frac{1}{90} ) \cdot (-30)- \frac{5}{3} = \frac{30}{90} - \frac{5}{3} = \frac{30}{90} - \frac{150}{90} = \\ \\ =- \frac{120}{90} =- \frac{4}{3}$