Question

(-7/4) × (-5/8) =

(+3/10) × (-11/15) =

(+4/3) × (+5/7) =

(-6/5) × (+4/15) =

DIVISÃO DE NÚMEROS RACIONAIS ALGUEM ME AJUDA PFV​

Answer 1

Explicação passo-a-passo:

A

$- \dfrac{7}{4} \times - \dfrac{5}{8}$

$\dfrac{35}{32}$

B)

$\dfrac{3}{10} \times - \dfrac{11}{15}$

$- \dfrac{33}{150}$

$- \dfrac{33 {}^{ \div 3} }{150 {}^{ \div 3} }$

$- \dfrac{11}{50}$

C)

$\dfrac{4}{3} \times \dfrac{5}{7}$

$\dfrac{20}{21}$

D

$- \dfrac{6}{5} \times \dfrac{4}{15}$

$- \dfrac{24}{75}$

$- \dfrac{24 {}^{ \div 3} }{75 {}^{ \div 3} }$

$- \dfrac{8}{25}$

Answer 2

Oie, tudo bom?

a)

$= ( - \frac{7}{4} ) \: . \: ( - \frac{5}{8} ) \\ = \frac{7}{4} \: . \: \frac{5}{8} \\ = \frac{7 \: . \: 5}{4 \: . \: 8} \\ \boxed{ = \frac{35}{32} }$

b)

$= \frac{3}{10} \: . \: ( - \frac{11}{15} ) \\ = - \frac{3}{10} \: . \: \frac{11}{15} \: \: \: \: \: \: mdc(3) \\ = - \frac{1}{10} \: . \: \frac{11}{5} \\ = - \frac{1 \: . \: 11}{10 \: . \: 5} \\ \boxed{ = - \frac{11}{50} }$

c)

$= \frac{4}{3} \: . \: \frac{5}{7} \\ = \frac{4 \: . \: 5}{3 \: . \: 7} \\ \boxed{ = \frac{20}{21} }$

d)

$= ( - \frac{6}{5} ) \: . \: \frac{4}{15} \\ = - \frac{6}{5} \: . \: \frac{4}{15} \: \: \: \: \: \: mdc(3) \\ = - \frac{2}{5} \: . \: \frac{4}{5} \\ = - \frac{2 \: . \: 4}{5 \: . \: 5} \\ \boxed{ = - \frac{8}{25} }$

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