1/2 . ( 2/9 + 3/7 - 5/27 )
=1/2 . ( 2/9-5/27)+3/7
=1/2 . (1/27+3/7)
=1/2 .
\(\frac{1}{2}\times\left(\frac{2}{9}+\frac{3}{7}-\frac{5}{21}\right)\)
\(=\frac{1}{2}\times\frac{88}{189}\)
\(=\frac{44}{189}\)
Học Tốt
\(\frac{1}{2}\left(\frac{2}{9}+\frac{3}{7}-\frac{5}{27}\right)\)
\(=\frac{1}{2}.\left(\frac{2}{9}-\frac{5}{27}\right)+\frac{3}{7}\)
\(=\frac{1}{2}.\left(\frac{1}{27}+\frac{3}{7}\right)\)
\(=\frac{1}{2}.\frac{88}{189}\)
\(=\frac{44}{189}\)