Question

tính nhanh:  G= \(3\frac{5}{7}+4\frac{3}{5}+1\frac{2}{7}+3\frac{1}{5}-\frac{4}{5}\)

Answer 1

Ta có: 

G=\(3\frac{5}{7}+4\frac{3}{5}+1\frac{2}{7}\)\(+3\frac{1}{5}-\frac{4}{5}\)

   =\(3+\frac{5}{7}+4+\frac{3}{5}+1+\frac{2}{7}+3+\frac{1}{5}-\frac{4}{5}\)

    =\(\left(3+4+1+3\right)+\left(\frac{5}{7}+\frac{3}{5}+\frac{2}{7}+\frac{1}{5}-\frac{4}{5}\right)\)

    =\(11+\left[\left(\frac{5}{7}+\frac{2}{7}\right)+\left(\frac{3}{5}+\frac{1}{5}-\frac{4}{5}\right)\right]\)

    =\(11+\left[\frac{7}{7}+\frac{0}{5}\right]\)

    =\(11+\left[1+0\right]\)

    =\(11+1\)

     =12

ĐÃ GIẢI CHI TIẾT RÙI NHÉ. **** NHA