\(\frac{3}{4}.\frac{16}{9}-\frac{7}{5}:\frac{-21}{20}\)
=>\(\frac{3}{4}.\frac{16}{9}-\frac{7}{5}.\frac{20}{-21}\)
Rút gọn biểu thức bắng cách chiệt tiêu ta sẽ có
\(\frac{4}{3}-\frac{4}{-3}\)
=>\(\frac{8}{3}\)
\(\frac{3}{4}.\frac{16}{9}-\frac{7}{5}:\frac{21}{20}\)
\(=\frac{4}{3}-\frac{-4}{3}\)
\(=\frac{8}{3}\)
Nhớ tick giùm mik nha!
\(\frac{3}{4}.\frac{16}{9}-\frac{7}{5}:\frac{-21}{20}\)
\(=\frac{3.16}{4.9}-\frac{7}{5}.\frac{20}{-21}\)
\(=\frac{3.4.4}{4.3.3}-\left[-\left(\frac{7.20}{5.21}\right)\right]\)
\(=\frac{4}{3}+\frac{7.5.4}{5.7.3}=\frac{4}{3}+\frac{4}{3}=\frac{8}{3}\)