Solution

In[53]:=

(*1*)x * x + x + 1/.x10

Out[53]=

111

In[54]:=

(*2*)x + y/.{x1, y2}

Out[54]=

3

In[55]:=

(*3*) (a + 1)/(b + 2)/.{a3, b4}

Out[55]=

2/3

In[56]:=

(*4*)x = x/.x10

Out[56]=

10

In[57]:=

Clear[x]

This is of course ridiculous.


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