Use 4, 5, 6 and 7 to form the multiplication formula of multiplying two digits by two digits (the number can't be used repeatedly). Please write the formula of maximum and minimum product?

Use 4, 5, 6 and 7 to form the multiplication formula of multiplying two digits by two digits (the number can't be used repeatedly). Please write the formula of maximum and minimum product?

74*65
47*56