∵5/4÷0.7=25/14∴0.7×25/I4=5/4
0.7×□=5/4□=5/4÷0.7=5/4÷(7/10) =5/4×10/7=25/14或者是□=5/4÷0.7=1.25÷0.7=1.785714286