Question

alguém me ajuda pfff?

Answer 1

9) é um quadrado de 6 x 6

6 * 6 = 36
tem 12 figuras pintadas

a fração é

$\dfrac{12}{36} \ \dfrac{\div}{\div}\ \dfrac{12}{12} => \dfrac{1}{3}$

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10) Simplifique as frações

a) 
$\dfrac{3}{6} \ \dfrac{\div}{\div}\ \dfrac{3}{3} => \dfrac{1}{2}$

b)
$\dfrac{6}{3} = 2$
Não dá uma fração

c)
$\dfrac{18}{32} \ \dfrac{\div}{\div}\ \dfrac{4}{4} => \dfrac{9}{16}$

d)
$\dfrac{12}{20} \ \dfrac{\div}{\div}\ \dfrac{4}{4} => \dfrac{3}{5}$

e)
$\dfrac{30}{70} \ \dfrac{\div}{\div}\ \dfrac{10}{10} => \dfrac{3}{7}$

f)
$\dfrac{18}{24} \ \dfrac{\div}{\div}\ \dfrac{6}{6} => \dfrac{3}{4}$

g)
$\dfrac{90}{12} \ \dfrac{\div}{\div}\ \dfrac{6}{6} => \dfrac{15}{2}$

h)
$\dfrac{36}{48} \ \dfrac{\div}{\div}\ \dfrac{12}{12} => \dfrac{3}{4}$

i)
$\dfrac{90}{120} \ \dfrac{\div}{\div}\ \dfrac{30}{30} => \dfrac{3}{4}$

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11) Quais são frações que representam o mesmo numero:

Somente as que são possíveis de simplificar as outras já são simplificadas

$\dfrac{75}{100} \ \dfrac{\div}{\div}\ \dfrac{25}{25} => \dfrac{3}{4}$

$\dfrac{4}{10} \ \dfrac{\div}{\div}\ \dfrac{2}{2} => \dfrac{2}{5}$

$\dfrac{15}{20} \ \dfrac{\div}{\div}\ \dfrac{5}{5} => \dfrac{3}{4}$

$\dfrac{6}{8} \ \dfrac{\div}{\div}\ \dfrac{2}{2} => \dfrac{3}{4}$

$\dfrac{100}{75} \ \dfrac{\div}{\div}\ \dfrac{25}{25} => \dfrac{4}{3}$

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12) Simplifique as frações:

a)
$\dfrac{60}{90} \ \dfrac{\div}{\div}\ \dfrac{30}{30} => \dfrac{2}{3}$

b)
$\dfrac{32}{64} \ \dfrac{\div}{\div}\ \dfrac{32}{32} => \dfrac{1}{2}$

c)
$\dfrac{88}{110} \ \dfrac{\div}{\div}\ \dfrac{22}{22} => \dfrac{4}{5}$

d)
$\dfrac{100}{25} = 4$

e)
$\dfrac{81}{108} \ \dfrac{\div}{\div}\ \dfrac{27}{27} => \dfrac{3}{4}$

f)
$\dfrac{196}{210} \ \dfrac{\div}{\div}\ \dfrac{14}{14} => \dfrac{14}{15}$

g)
$\dfrac{360}{270} \ \dfrac{\div}{\div}\ \dfrac{90}{90} => \dfrac{4}{3}$

h)
$\dfrac{135}{189} \ \dfrac{\div}{\div}\ \dfrac{27}{27} => \dfrac{5}{7}$

i)
$\dfrac{231}{924} \ \dfrac{\div}{\div}\ \dfrac{231}{231} => \dfrac{1}{4}$

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13) Considere as frações

$\dfrac{1100}{4004} \ \dfrac{\div}{\div}\ \dfrac{24}{24} => \dfrac{25}{91}$

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14) Reduza ao menor denominador comum 
Tem que fazer mmc das frações:

a)

mmc de 4, 5 = 20
$\dfrac{3}{4}\ , \ \dfrac{1}{5} \\ \\ \\ \dfrac{20/4*3}{20} = \dfrac{15}{20} \\ \\ \\ \dfrac{20/5*1}{20} = \dfrac{4}{20}$

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b)

mmc de 2, 3 = 6

$\dfrac{1}{2}\ , \ \dfrac{2}{3} \\ \\ \\ \dfrac{6/2*1}{6} = \dfrac{3}{6} \\ \\ \\ \dfrac{6/3*2}{6} = \dfrac{4}{6}$

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c)
mmc de 3, 9 = 9

$\dfrac{2}{3}\ , \ \dfrac{7}{9} \\ \\ \\ \dfrac{9/3*2}{9} = \dfrac{6}{9} \\ \\ \\ \dfrac{9/9*7}{9} = \dfrac{7}{9}$

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d)
mmc de 8, 6 = 24

$\dfrac{1}{8}\ , \ \dfrac{5}{6} \\ \\ \\ \dfrac{24/8*1}{24} = \dfrac{3}{24} \\ \\ \\ \dfrac{24/6*5}{24} = \dfrac{20}{24}$