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a, \(\frac{-3}{7}+\frac{5}{13}-\frac{4}{7}+\frac{8}{13}\)
\(=\frac{-3}{7}-\frac{4}{7}+\frac{5}{13}+\frac{8}{13}\)
\(=-\frac{7}{7}+\frac{13}{13}=-1+1=0\)
b, \(\frac{-5}{14}-\frac{2}{-14}+\frac{1}{8}+\frac{1}{8}\)
\(=\frac{-5}{14}+\frac{2}{14}+\frac{1}{8}+\frac{1}{8}\)
\(=-\frac{3}{14}+\frac{1}{4}=\frac{1}{28}\)
c,\(-\frac{5}{13}-\left(\frac{3}{5}+\frac{3}{13}-\frac{4}{10}\right)\)
\(=-\frac{5}{13}-\frac{3}{13}-\frac{3}{5}+\frac{4}{10}\)
\(=-\frac{8}{13}-\frac{3}{5}+\frac{4}{10}=-\frac{79}{65}+\frac{4}{10}=-\frac{53}{65}\)
d, \(\left[\left(\frac{1}{8}-\frac{9}{7}+\frac{4}{6}-\frac{12}{7}-\frac{1}{2}\right)+\frac{5}{9}\right]\)
\(=\left[\left(\frac{1}{8}-\frac{9}{7}+\frac{2}{3}-\frac{12}{7}-\frac{1}{2}\right)+\frac{5}{9}\right]\)
\(=\left[\left(\frac{1}{8}-\frac{1}{2}-\frac{9}{7}-\frac{12}{7}+\frac{2}{3}\right)+\frac{5}{9}\right]\)
\(=-\frac{65}{24}+\frac{5}{9}=-2\frac{11}{72}\)
a)-3/7+5/13-4/7+8/13
=-3/7-4/7+5/13+8/13
=-7/7+13/13
=-1+1
=0
AI NHANH NHẤT MÌNH TICK
TÍNH HỢP LÝ
\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}+\frac{6}{7}\)
\(\dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}+\dfrac{6}{7}\)
\(=\left(\dfrac{3}{7}+\dfrac{6}{7}\right).\left(\dfrac{9}{26}-\dfrac{1}{13}\right).\dfrac{1}{14}\)
\(=\dfrac{9}{7}.\dfrac{7}{26}.\dfrac{1}{14}\)
\(=\dfrac{18}{14}.\dfrac{7}{26}.\dfrac{1}{14}=\dfrac{126}{5096}=\dfrac{9}{364}\)
\(\frac{3}{7}\times\frac{9}{25}-\frac{1}{14}\times\frac{1}{13}\)
\(=\frac{27}{175}-\frac{1}{182}\)
\(=\frac{702}{4550}-\frac{25}{4550}\)
\(=\frac{677}{4550}\)
\(\frac{3}{7}.\frac{9}{25}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{27}{175}-\frac{1}{182}\)
\(=\frac{702}{4550}-\frac{25}{4550}\)
\(=\frac{677}{4550}\)
3/7 . 9/26 - 1/14 . 1/13 - 1/7=0 nhaaa
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