Question

Giá trị của biểu thức A={[(-1/2 +-1/9)-7/18]+(3/5+4/35+2/7)+1/127}

Answer 1

\(A=\left\{\left[\left(\frac{-1}{2}+\frac{-1}{9}\right)-\frac{7}{18}\right]+\left(\frac{3}{5}+\frac{4}{35}+\frac{2}{7}\right)+\frac{1}{127}\right\}\)

\(\Rightarrow A=\left\{\left[\frac{-11}{18}-\frac{7}{18}\right]+1+\frac{1}{127}\right\}\)

\(A=\left(-1\right)+1+\frac{1}{127}\)

\(A=0+\frac{1}{127}\)

\(A=\frac{1}{127}\)