1. The problem appears to involve simplifying or evaluating the expression $1xx\sqrt{xx} + xx - 1.3$. However, the expression is unclear due to the use of "xx" and symbols. Assuming "xx" represents a variable $x$, the expression can be interpreted as $1x\sqrt{x} + x - 1.3$ or simply $x\sqrt{x} + x - 1.3$. 2. Let's state the problem clearly: Simplify or evaluate the expression $$x\sqrt{x} + x - 1.3$$ for a given value of $x$ or simplify it algebraically. 3. Recall that $\sqrt{x} = x^{1/2}$, so $x\sqrt{x} = x \cdot x^{1/2} = x^{1 + 1/2} = x^{3/2}$. 4. Substitute this back into the expression: $$x^{3/2} + x - 1.3$$ 5. This is the simplified form of the expression. 6. If you want to evaluate for a specific $x$, substitute the value and calculate. 7. For example, if $x=4$: $$4^{3/2} + 4 - 1.3 = (4^{1})^{3/2} + 4 - 1.3 = (4^{1.5}) + 4 - 1.3 = 8 + 4 - 1.3 = 10.7$$ 8. Therefore, the simplified expression is $$x^{3/2} + x - 1.3$$ and can be evaluated for any $x$.