Question

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Answer 1

Respuesta:

1) -21

2) 21/20

3) 25/126

Explicación paso a paso:

1)

$\left(\frac{49}{13}\right)\left(-\frac{39}{7}\right)=-\frac{49}{13}\cdot \frac{39}{7}=-\frac{49\cdot \:39}{13\cdot \:7}=-\frac{1911}{13\cdot \:7}=-\frac{1911}{91}=-21$

2)

$-\left(-\frac{3}{4}\right)+\left(-\frac{1}{5}\right)+\left(\frac{1}{2}\right)=\frac{3}{4}-\frac{1}{5}+\frac{1}{2}=\frac{15-4+10}{20}=\frac{21}{20}$

3)

$-\left(\frac{3}{7}\right)-\left(-\frac{1}{14}\right)-\left(-\frac{5}{9}\right)=-\frac{3}{7}+\frac{1}{14}+\frac{5}{9}=\frac{-54+9+70}{126}=\frac{25}{126}$

Answer 2

Explicación paso a paso:

(49/13) (-39/7) = -21

-(-3/4)+(-1/5)+(1/2)= 1 1/20 ó 21/20

-(+3/7)-(-1/14)-(-5/9)= 25/126