Tính giá trị biểu thức: 7/27 + 1/56 - 34/27

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\(\frac{7}{27}+\frac{1}{56}-\frac{34}{27}=\frac{1}{56}+\frac{2}{27}-\frac{34}{27}=\frac{1}{56}-\frac{27}{27}=\frac{1}{56}-1=\frac{-55}{56}\)

b) \(\frac{-3}{8}+\frac{12}{25}+\frac{5}{-8}+\frac{13}{25}=\frac{-3}{8}+\frac{5}{-8}+\frac{12}{25}+\frac{13}{25}=-1+1=0\)

c) \(\frac{1}{3}+\frac{-3}{4}+\frac{3}{5}+\frac{-1}{36}+\frac{1}{15}+\frac{-2}{9}\)

\(=\frac{1}{3}+\frac{3}{5}+\frac{1}{15}+\frac{-2}{9}+\frac{-3}{4}+\frac{-1}{36}\)

\(=\frac{5}{15}+\frac{9}{15}+\frac{1}{15}+\frac{-8}{36}+\frac{-27}{36}+\frac{-1}{36}=1\ +\left(-1\right)=0\)