You can build an expression tree which contains a division assignment operation using Expression.DivideAssign method. For example, you have the following code.
int myInt;
myInt = 60;
myInt /= 5;
Console.WriteLine(myInt);
Here is the code that is required to build the same functionality using expression tree.
ParameterExpression myIntVariableExpr = Expression.Variable(typeof(int), "myInt");
BlockExpression addAssignExpr = Expression.Block(
new ParameterExpression[] { myIntVariableExpr },
Expression.Assign(myIntVariableExpr, Expression.Constant(60)),
Expression.DivideAssign(
myIntVariableExpr,
Expression.Constant(5)
)
);
Console.WriteLine(Expression.Lambda<Func<int>>(addAssignExpr).Compile()());