Решение:

8,1$$\cdot$$\frac{3}{5}$$-8,1$$\cdot$$\frac{4}{9}$$ = 8,1$$\cdot$$($$\frac{3}{5}$$ - $$\frac{4}{9}$$) = 8,1$$\cdot$$($$\frac{27}{45}$$ - $$\frac{20}{45}$$) = 8,1$$\cdot$$\frac{7}{45}$$ = 0,9$$\cdot$$\frac{7}{5}$$ = $$\frac{6,3}{5}$$ = 1,26

Ответ: 1,26