3.
a)
[tex]y = \frac{35 \times 6}{5} = \frac{5 \times 6 \times 7}{5} = 6 \times 7 = 42[/tex]
b)
[tex]z = \frac{10 \times 14}{7} = \frac{10 \times 2 \times 7}{7} = 10 \times 2 = 20[/tex]
c)
[tex]t = \frac{8 \times 6}{3} = \frac{8 \times 2 \times 3}{3} = 8 \times 2 = 16[/tex]
d)
[tex]u = \frac{18 \times 11}{9} = \frac{9 \times 2 \times 11}{9} = 2 \times 11 = 22[/tex]
4.
a)
[tex]a × b = 0,3 × 15 = \frac{3}{10} \times 15 = \frac{3 \times 15}{10} = \frac{45}{10} = 4.5[/tex]
b)
[tex]a \times b = 1.2 \times 2.5 = \frac{12}{10} \times \frac{25}{10} = \frac{12 \times 25}{100} = \frac{300}{100} = 3[/tex]
c)
[tex]a \times b = 8 \times (0.25 + \frac{3}{2} ) = 8 \times ( \frac{25}{100} + \frac{3}{2} )[/tex]
[tex]= 8 \times \frac{25}{100} + 8 \times \frac{3}{2} = \frac{8 \times 25}{100} + \frac{8 \times 3}{2} = \frac{200}{100} + \frac{24}{2} [/tex]
[tex] = 2 + 12 = 14[/tex]
d)
[tex]a \times b = 12 \times ( \frac{1}{2} + \frac{1}{2} :3) = 12 \times ( \frac{1}{2} + \frac{ \frac{1}{2} }{3})[/tex]
[tex] = 12 \times ( \frac{1}{2} + \frac{1}{2 \times 3}) = 12 \times ( \frac{1}{2} + \frac{1}{6}) [/tex]
[tex]= 12 \times \frac{1}{2} + 12 \times \frac{1}{6} = \frac{12}{2} + \frac{12}{6} = 6 + 2 = 8[/tex]
