Question

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Answer 1

Coroana???

27.

$\frac{20}{30} = \frac{4}{6} = \frac{2}{3}$

$\frac{250}{350} = \frac{25}{35} = \frac{5}{7}$

$\frac{2 \times 7 \times 3}{3 \times 7 \times 11} = \frac{2 \times 21}{3 \times 77} = \frac{42}{231} = \frac{6}{33} = \frac{2}{11}$

$\frac{ {2}^{3} }{ {2}^{5} } = \frac{8}{32} = \frac{1}{4}$

28.

a)x=2

y=4

b)x=9

y=5