Question

Va rog din inima sa ma ajutati! Repede!

Answer 1

3.

a)

$y = \frac{35 \times 6}{5} = \frac{5 \times 6 \times 7}{5} = 6 \times 7 = 42$

b)

$z = \frac{10 \times 14}{7} = \frac{10 \times 2 \times 7}{7} = 10 \times 2 = 20$

c)

$t = \frac{8 \times 6}{3} = \frac{8 \times 2 \times 3}{3} = 8 \times 2 = 16$

d)

$u = \frac{18 \times 11}{9} = \frac{9 \times 2 \times 11}{9} = 2 \times 11 = 22$

4.

a)

$a × b = 0,3 × 15 = \frac{3}{10} \times 15 = \frac{3 \times 15}{10} = \frac{45}{10} = 4.5$

b)

$a \times b = 1.2 \times 2.5 = \frac{12}{10} \times \frac{25}{10} = \frac{12 \times 25}{100} = \frac{300}{100} = 3$

c)

$a \times b = 8 \times (0.25 + \frac{3}{2} ) = 8 \times ( \frac{25}{100} + \frac{3}{2} )$

$= 8 \times \frac{25}{100} + 8 \times \frac{3}{2} = \frac{8 \times 25}{100} + \frac{8 \times 3}{2} = \frac{200}{100} + \frac{24}{2}$

$= 2 + 12 = 14$

d)

$a \times b = 12 \times ( \frac{1}{2} + \frac{1}{2} :3) = 12 \times ( \frac{1}{2} + \frac{ \frac{1}{2} }{3})$

$= 12 \times ( \frac{1}{2} + \frac{1}{2 \times 3}) = 12 \times ( \frac{1}{2} + \frac{1}{6})$

$= 12 \times \frac{1}{2} + 12 \times \frac{1}{6} = \frac{12}{2} + \frac{12}{6} = 6 + 2 = 8$