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Vầy ai giải nổi khó hỉu lắm

Đây là bài thực hiện phép tính nha mấy bạn(tính nhanh nếu có thể)

a) 5

b) 11/6

2/9*(11/13-5/11)-2/9*(-2/13+6/11) =  2/9*(11/13-5/11+2/13-6/11) = 2/9*(1-1) = 2/9*0 = 0

K cho mình nha !!!!!!!!!!!!!!

`Answer:`

\(\frac{2}{9}.\left(\frac{11}{13}-\frac{5}{11}\right)-\frac{2}{9}.\left(-\frac{2}{13}+\frac{6}{11}\right)\)

\(=\frac{2}{9}.\left(\frac{11}{13}-\frac{5}{11}+\frac{2}{13}-\frac{6}{11}\right)\)

\(=\frac{2}{9}.[\left(\frac{11}{13}+\frac{2}{13}\right)+\left(-\frac{5}{11}-\frac{6}{11}\right)]\)

\(=\frac{2}{9}.\left(1-1\right)\)

\(=0\)

a: =-5/11-6/11+1=-11/11+1=0

b: =-13/17-13/21-4/17=-1-13/21=-34/21

b: \(=-\dfrac{5}{12}\cdot\dfrac{9}{20}\cdot\dfrac{7}{17}=\dfrac{-21}{272}\)

d: \(=\dfrac{13}{17}\left(-\dfrac{4}{5}-\dfrac{3}{4}\right)=\dfrac{13}{17}\cdot\dfrac{-31}{20}=\dfrac{-403}{340}\)

\(A=\dfrac{5}{11}.\dfrac{5}{7}+\dfrac{5}{11}.\dfrac{2}{7}+\dfrac{6}{11}=\dfrac{5}{11}\left(\dfrac{5}{7}+\dfrac{2}{7}\right)+\dfrac{6}{11}=\dfrac{5}{11}.1+\dfrac{6}{11}=\dfrac{5}{11}+\dfrac{6}{11}=\dfrac{11}{11}=1\)

\(B=\dfrac{3}{13}.\dfrac{6}{11}+\dfrac{3}{13}.\dfrac{9}{11}-\dfrac{3}{13}.\dfrac{4}{11}=\dfrac{3}{13}\left(\dfrac{6}{11}+\dfrac{9}{11}-\dfrac{4}{11}\right)=\dfrac{3}{13}.1=\dfrac{3}{13}\)

\(C=\left(\dfrac{12}{16}-\dfrac{31}{22}+\dfrac{14}{91}\right)\left(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\right)=\left(\dfrac{12}{16}-\dfrac{31}{22}+\dfrac{14}{91}\right)\left(\dfrac{3}{6}-\dfrac{2}{6}-\dfrac{1}{6}\right)=\left(\dfrac{12}{16}-\dfrac{31}{22}+\dfrac{14}{91}\right).0=0\)