Question

Bài: 3 thực hiện phép tính:

b) \(\frac{-7}{31}+\left(\frac{24}{17}+\frac{7}{31}\right)\)                                  c) \(\frac{3}{7}+\left(\frac{-1}{5}+\frac{-3}{7}\right)\)

Answer 1

a.

\(-\frac{7}{31}+\left(\frac{24}{17}+\frac{7}{31}\right)=-\frac{7}{31}+\frac{7}{31}+\frac{24}{17}=\frac{24}{17}\)

b.

\(\frac{3}{7}+\left(-\frac{1}{5}+\frac{-3}{7}\right)=\frac{3}{7}-\frac{3}{7}-\frac{1}{5}=-\frac{1}{5}\)

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Answer 2

b) \(-\frac{7}{31}+\left(\frac{24}{14}+\frac{7}{31}\right)\)

\(=-\frac{7}{31}+\frac{24}{17}+\frac{7}{31}\)

\(=\left(-\frac{7}{31}+\frac{7}{31}\right)+\frac{24}{17}\)

\(=0+\frac{24}{17}=\frac{24}{17}\)

c) \(\frac{3}{7}+\left(-\frac{1}{5}+\left(-\frac{3}{7}\right)\right)\)

\(=\frac{3}{7}-\frac{1}{5}-\frac{3}{7}\)

\(=\left(\frac{3}{7}-\frac{3}{7}\right)-\frac{1}{5}\)

\(=0-\frac{1}{5}=-\frac{1}{5}\)

 

Answer 3

b) -7/31+(24/17+3/31) = -7/31+24/17+7/31= (-7/31+7/31)+24/17= 0+24/17=24/17

c) 3/7+(-1/5+-3/7)= 3/7+-1/5+-3/7= ( 3/7+-3/7)+-1/5= 0+-1/5 = -1/5

Answer 4

b) -7/31+(24/17+7/31)

= -7/31+863/527

= 24/17

c) 3/7+(-1/5+-3/7)

= 3/7+-22/35

= -1/5

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