Question

efetue as operações entre números racionais

a)(-1/3)×(-1/4)×(-2/5)×(-3/7)=

b) (-1/4)×(-1/5)×(-2/7)=

c) (-3/4)÷(-2/7)÷(-3/5)=

d) (2/3)÷(3/7)÷(1/8)=

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Answer 1

Explicação passo-a-passo:

A)

$- \dfrac{1}{3} \times - \dfrac{1}{4} \times - \dfrac{2}{5} \times - \dfrac{3}{7}$

$\dfrac{6}{420}$

$\dfrac{6 {}^{ \div 6} }{420 {}^{ \div 6} }$

$\dfrac{1}{70}$

B)

$- \dfrac{1}{4} \times - \dfrac{1}{5} \times - \dfrac{2}{7}$

$- \dfrac{2}{140}$

$- \dfrac{2 {}^{ \div 2} }{140 {}^{ \div 2} }$

$- \dfrac{1}{70}$

C)

$- \dfrac{3}{4} \div - \dfrac{2}{7} \div - \dfrac{3}{5}$

$- \dfrac{3}{4} \times - \dfrac{7}{2} \times - \dfrac{5}{3}$

$- \dfrac{105}{24}$

$- \dfrac{105 {}^{ \div 3} }{24 {}^{ \div 3} }$

$- \dfrac{35}{8}$

D)

$\dfrac{2}{3} \div \dfrac{3}{7} \div \dfrac{1}{8}$

$\dfrac{2}{3} \times \dfrac{7}{3} \times \dfrac{8}{1}$

$\dfrac{112}{9}$