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a. \(\frac{-3}{7}+\frac{15}{26}-\frac{2}{13}+\frac{3}{7}\)
\(=\left(\frac{-3}{7}+\frac{3}{7}\right)+\frac{15}{26}-\frac{2}{13}\)
\(=\frac{15}{26}-\frac{2}{13}\)
\(=\frac{15}{26}-\frac{4}{26}=\frac{11}{26}\)
b. \(\frac{3}{7}-\frac{5}{3}\div\frac{1}{9}-\frac{3}{7}\)
\(=\frac{3}{7}-\frac{5}{3}\times\frac{9}{1}-\frac{3}{7}\)
\(=\frac{3}{7}-15-\frac{3}{7}\)
\(=-15\)
\(-\frac{3}{7}+\frac{15}{26}-\frac{2}{13}+\frac{3}{7}=\frac{15}{26}-\frac{2}{13}=\frac{11}{26}\)
\(\frac{2.3}{7}-\frac{5}{3}:\frac{1}{9}-\frac{3}{7}=\frac{6}{7}-15-\frac{3}{7}=\frac{3}{7}-15=-\frac{102}{7}\)
|(5 - 7)2 - 26| - 315 . 3 : 313
= |(-2)2 - 26| - 316 : 313
= |4 - 26| - 33
= |-22| - 27
= 22 - 27 = -5
\(-\frac{3}{7}+\frac{15}{26}-\left(\frac{2}{13}-\frac{3}{7}\right)\)
\(=-\frac{3}{7}+\frac{15}{26}-\frac{2}{13}+\frac{3}{7}\)
\(=\left(-\frac{3}{7}+\frac{3}{7}\right)+\left(\frac{15}{26}-\frac{2}{13}\right)\)
\(=\left(-\frac{3}{7}+\frac{3}{7}\right)+\left(\frac{15}{26}-\frac{4}{26}\right)\)
\(=0+\frac{11}{26}\)
\(\Rightarrow=\frac{11}{26}\)
Tích nha
l(5 + 7)2 - 26l - 315 . 3 : 313
= (5 + 7)2 - 26 - 316 : 313
= 122 - 26 - 33
= 144 - 26 - 27
= 144 - (26 + 27)
= 144 - 53
= 91
#Hoc tot!!!
~NTTH~
=\(|\left(5-7\right)^2-26|-3^{15}.3:3^{13}\)
=\(|\left(-24\right)-26|-3^{16}:3^{13}\)
=\(|-50|-3^3\)
=\(50-27\)
=\(23\)
=-3/7+15/26-2/13+3/7=15/26-2/13=15/26-4/26=11/26
11/26