\(\frac{8}{5}-\frac{1}{2}\div\frac{1}{4}\times\left(\frac{3}{7}+\frac{1}{4}\right)\)
\(=\frac{8}{5}-2\times\frac{19}{28}\)
\(=\frac{8}{5}-\frac{19}{14}\)
\(=\frac{17}{70}\)
\(\frac{8}{5}-\frac{1}{2}:\frac{1}{4}.\left(\frac{3}{7}+\frac{1}{4}\right)=\frac{8}{5}-\frac{1}{2}.4\left(\frac{3}{7}+\frac{1}{4}\right)\)
\(=\frac{8}{5}-2\left(\frac{3}{7}+\frac{1}{4}\right)\)
\(=\frac{8}{5}-\frac{6}{7}+\frac{1}{2}\)
\(=\frac{8.7.2}{5.7.2}-\frac{6.5.2}{5.7.2}+\frac{5.7}{5.7.2}\)
\(=\frac{112}{70}-\frac{60}{70}+\frac{35}{70}\)
\(=\frac{87}{70}\)
k nha 
Vương Thu Trà
\(\frac{8}{5}-\frac{1}{2}\div\frac{2}{4}\times\left(\frac{3}{7}+\frac{1}{4}\right)\)
\(=\frac{8}{5}-1\times\frac{12}{28}\)
\(=\frac{8}{5}-\frac{12}{28}\)
\(=\frac{129}{140}\)
\(\frac{8}{5}-\frac{1}{2}:\frac{1}{4}.\left(\frac{3}{7}+\frac{1}{4}\right)\)
=\(\frac{8}{5}-\frac{1}{2}:\frac{1}{4}.\left(\frac{12}{28}+\frac{7}{28}\right)\)
=\(\frac{8}{5}-\frac{1}{2}:\frac{1}{4}.\frac{19}{28}\)
=\(\frac{8}{5}-\left(\frac{1}{2}:\frac{1}{4}.\frac{19}{28}\right)\)
=\(\frac{8}{5}-\left(\frac{14}{28}:\frac{7}{28}.\frac{19}{28}\right)\)
=\(\frac{8}{5}-\frac{26}{28}\)
=\(\frac{8}{5}-\frac{13}{14}\)
=\(\frac{112}{70}-\frac{65}{70}\)
=\(\frac{47}{70}\)
Các bạn ơi!! Đây có phải toán lớp 6 kết quả cuối cùng là số âm ko??
VD : -34/65
