Question

Me ajudem é para AGORA

14/7 × 13/8 + 12/9

17/7 ÷ 8/4 - 4/10

Answer 1

Resposta:

Explicação passo a passo:

= 14/7 × 13/8 + 12/9 (:3)/(:3)

= 2 . 13/8 + 4/3

= 13. 2/8 (:2)/(:2) + 4/3

= 13 . 1/4 + 4/3

= 13/4 + 4/3

Mmc (4,3)= 12

= (3.13+4.4)/12

= (39+16)/12

R.: = 55/12

B)

= 17/7 ÷ 8/4 - 4/10 (:2)/(:2)

= 17/7 ÷ 2 - 2/5

= 17/7 . 1/2 - 2/5

= 17/14 - 2/5

Mmc (14,5)= 70

= (5.17 - 14.2)/70

= (85 - 28)/70

R.:= 57/70

Answer 2

Resposta:

Vamos calcular parte por parte ↓

$\frac{14}{7}\times \frac{13}{8}+\frac{12}{9}\\\\Multiplicar \ e \ dividir:\\\\\frac{14}{7}=2\times \frac{13}{8}\\\\2\times \frac{13}{8}=\frac{26}{8} \\\\Somar:\\\\\frac{26}{8}+\frac{12}{9}\\\\\frac{13}{4}+\frac{12}{9}\\\\\frac{13}{4}+\frac{4}{3}\\\\Achar \ o \ multiplo \ comum :\\\\\frac{39}{12}+\frac{16}{12}\\\\\frac{39+16}{12}\\\\\mathrm{Somar:}\:39+16=55\\\\\frac{55}{12}$

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$\frac{17}{7}\div \frac{8}{4}-\frac{4}{10}\\\\\mathrm{Aplicar\:as\:propriedades\:das\:fracoes}:\quad \frac{a}{b}\div \frac{c}{d}=\frac{a}{b}\times \frac{d}{c}\\\\\frac{17}{7}\times \frac{4}{8}-\frac{4}{10}\\\\\frac{4}{10}=\frac{2}{5}\\\\\frac{17}{14}-\frac{2}{5}\\\\\mathrm{Achar \ multiplo \ comum} \\\\\frac{85}{70}-\frac{28}{70}\\\\\mathrm{Combinar \ as \ fracoes:}\\\\\frac{85-28}{70}\\\\\mathrm{Subtrair:}\:85-28=57\\\\\frac{57}{70}$