3. b)
[tex]y = \frac{35 \times 6}{5} = \frac{210}{5} = 42[/tex]
c)
[tex]z = \frac{10 \times 14}{7} = \frac{140}{7} = 20[/tex]
d)
[tex]t = \frac{8 \times 6}{3} = \frac{48}{3} = 16[/tex]
e)
[tex]u = \frac{18 \times 11}{9} = \frac{198}{9 } = 22[/tex]
4.a) a•b=0,3•15=4,5
b)
[tex]a \times b = 1.2 \times 2.5 = \frac{12}{10} \times \frac{25}{10} = \frac{12 \times 25}{10 \times 10} = \frac{300}{10} = 30[/tex]
c)a•b=
[tex] = 8 \times (0.25 + \frac{3}{2} ) = 8 \times ( \frac{25}{100} + \frac{3}{2}) = 8 \times ( \frac{25}{100} + \frac{150}{100} ) = 8 \times \frac{175}{100} = \frac{1400}{100} = 14[/tex]
d)a•b=
[tex]( \frac{1}{2} + \frac{1}{2} \div 3) \times 12 = ( \frac{1}{2} + \frac{1}{2} \times \frac{1}{3} ) \times 12 = ( \frac{1}{2} + \frac{1 \times 1}{2 \times 3} ) \times 12 = ( \frac{1}{2} + \frac{1}{6} ) \times 12 = ( \frac{3}{6} + \frac{1}{6} ) \times 12 = \frac{4}{6} \times 12 = \frac{4 \times 12}{6} = \frac{48}{6} = 8[/tex]
*spune-mi daca nu intelegi ceva
