Ta có: \(\frac{2}{5}.\frac{7}{4}-\frac{2}{5}.\frac{3}{7}\)
\(=\frac{2}{5}.\left(\frac{7}{4}-\frac{3}{7}\right)\)
\(=\frac{2}{5}.\frac{37}{28}\)
\(=\frac{37}{70}\)
2/7×7/4-2/5×3/7
2/5×(7/4-3/7)
2/5×37/28
37/70
\(\frac{2}{5}\times\frac{7}{4}-\frac{2}{5}\times\frac{3}{7}\)
\(=\frac{2}{5}\times\left(\frac{7}{4}-\frac{3}{7}\right)\)
\(=\frac{2}{5}\times\frac{37}{28}\)
\(=\frac{37}{70}\)
Học tốt
2/5 x 7/4 - 2/5 x 3/7 = 2/5 x ( 7/4 - 3/7 )
= 2/5 x 37/28
= 37/70
Hok tốt
\(\frac{2}{5}.\frac{7}{4}-\frac{2}{5}.\frac{3}{7}\)
\(=\frac{2}{5}.\left(\frac{7}{4}-\frac{3}{7}\right)\)
\(=\frac{2}{5}.\frac{37}{28}\)
\(=\frac{37}{70}\)
\(\text{Giải :}\)
\(\frac{2}{5}.\frac{7}{4}-\frac{2}{5}.\frac{3}{7}=\frac{2}{5}.\left(\frac{7}{4}-\frac{3}{7}\right)\)
\(=\frac{2}{5}.\frac{37}{28}=\frac{37}{70}\)
