Here are some more `funny factorisations'. Complete the following expressions so that each one gives a four digit number as the product of two two digit numbers and uses the digits 1 to 8 once and only once. Are these the only possible solutions?

** x ** = 1368
52 x ** = ****
*7 x *8 = ****
5* x 6* = ****

Now do the same with the digits 2 to 9 to get the following two solutions.

** x ** = 4876
** x ** = 5394

Is it possible to do this with the digits 0 to 7?