Bài tập 2 trang 48 VBT Toán 4 tập 2

 \(\eqalign{ & a)\,\,\,{3 \over 8} \times x = {4 \over 7} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = {4 \over 7}:{3 \over 8} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = {{32} \over {21}} \cr} \)

\(\eqalign{ & b)\,\,{1 \over 7}:x = {1 \over 3} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = {1 \over 7}:{1 \over 3} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = {3 \over 7} \cr}\)

-- Mod Toán lớp 4 HỌC247