Explicație pas cu pas:
a)
[tex] \frac{a}{3} = 5 \\ a = 5 \times 3 = 15[/tex]
b)
[tex] \frac{a}{1.(6)} = 1.2 \\ a = 1.(6) \times 1.2 = \frac{16 - 1}{9} \times \frac{12}{10} \\ a = \frac{15}{9} \times \frac{6}{5} = \frac{3}{9} \times \frac{6}{1} = \frac{1}{3} \times \frac{6}{1} = 2[/tex]
c) E =
[tex] {( \frac{1}{2} + \frac{3}{9} \div \frac{1}{6} )}^{2} \times {1}^{ \frac{3}{5} } = {( \frac{1}{2} + \frac{1}{3} \times \frac{6}{1} ) }^{2} \times 1 = \\ { (\frac{1}{2} + 2)}^{2} = { (\frac{1 + 4}{2} )}^{2} = \\ {( \frac{5}{2}) }^{2} = \\ \frac{25}{4} [/tex]
[tex] \frac{a}{ \frac{25}{4} } = 0.4 \\ a \div \frac{25}{4} = \frac{4}{10} \\ a = \frac{4}{10} \times \frac{25}{4} = \frac{25}{10} = \frac{5}{2} [/tex]
