Bài 3:
\(\dfrac{152}{253};\dfrac{215}{253};\dfrac{10}{10};\dfrac{26}{15};\dfrac{26}{11}\)
Bài 4:
\(\dfrac{3}{5}+\dfrac{2}{3}=\dfrac{19}{15}\)
\(\dfrac{12}{5}-2=\dfrac{2}{5}\)
\(\dfrac{3}{5}x\dfrac{2}{3}=\dfrac{2}{5}\)
\(\dfrac{6}{5}\times\dfrac{2}{3}:3=\dfrac{4}{15}\)
Câu cuối bằng \(\dfrac{1}{5}\) ( tự ghi đề )





