Question

[Nguyễn Thu Thảo]

Thực hiện phép tính ( hợp lí nếu có ) :

a) ( \(\frac{1}{4}\) + \(\frac{-5}{13}\) ) + ( \(\frac{2}{11}\) + \(\frac{-8}{13}\) + \(\frac{3}{4}\) )

b) ( \(\frac{21}{31}\) + \(\frac{-16}{7}\) ) + ( \(\frac{44}{53}\) + \(\frac{10}{31}\) ) + \(\frac{9}{53}\)

c) \(\frac{\frac{9}{45}-\frac{4}{13}-\frac{1}{3}}{\frac{3}{13}-\frac{1}{15}+\frac{2}{3}}\)

Answer 1

[Phương Trâm]

a) \(\left(\frac{1}{4}+-\frac{5}{13}\right)+\left(\frac{2}{11}+-\frac{8}{13}+\frac{3}{4}\right)\)

\(=\frac{2}{11}+\left(\frac{1}{4}+\frac{3}{4}\right)+\left(-\frac{5}{13}+-\frac{8}{13}\right)\)

\(=\frac{2}{11}+1+\left(-1\right)\)

\(=\frac{2}{11}+0\)

\(=\frac{2}{11}\)

b) \(\left(\frac{21}{31}+-\frac{16}{7}\right)+\left(\frac{44}{53}+\frac{10}{31}\right)+\frac{9}{53}\)

\(=-\frac{16}{7}+\left(\frac{21}{31}+\frac{10}{31}\right)+\left(\frac{44}{53}+\frac{9}{53}\right)\)

\(=-\frac{16}{7}+1+1\)

\(=-\frac{16}{7}+2\)

=\(-\frac{2}{7}\)

c) \(\frac{\frac{9}{45}-\frac{4}{13}-\frac{1}{3}}{\frac{3}{13}-\frac{1}{15}+\frac{2}{3}}\)

\(=-\frac{43}{81}\)

Answer 2

[Sáng]

:v sướng