<image>Exploring and Applying Multiplication Formulas 
$$(1)$$ As shown in Figure $$1$$, the area of the shaded part can be calculated as ______ $$.($$write in the form of the difference of squares of two numbers$$)$$ 
$$(2)$$ As shown in the figure, if the shaded part is cut out and reassembled into a rectangle, its width is ______ , its length is ______ , and its area is ______ $$.($$write in the form of the product of polynomials$$)$$ 
$$(3)$$ By comparing the areas of the shaded parts in the left and right figures, we can obtain the multiplication formula ______ $$.($$express in form of an equation$$)$$ 
$$(4)$$ Use the formula you derived to calculate the following.
$$① 10 \dfrac {1}{3}×9 \dfrac {2}{3}$$ __ $$②(2x-y+3)(2x-3+y)$$ 
