Answer
x y +z x ◦+x ◦, xyz++yx++, xyxy◦◦xy◦◦z◦+, xz×, zz+◦, yyyy◦◦◦, zx+yz+◦, for instance
Work Step by Step
-Giving six examples of well-formed formulae with three or
more operators in postfix notation over the set of symbols
{x, y, z} and the set of operators {+,×, ◦}.
--x y +z x ◦+x ◦, xyz++yx++, xyxy◦◦xy◦◦z◦+, xz×, zz+◦, yyyy◦◦◦, zx+yz+◦, for instance
