[tex]\display\bf\\1)\\\\19,25\cdot\dfrac{5}{11} =\dfrac{19,25\cdot 5}{11} =1,75\cdot 5=8,75\\\\2)\\\\5,76\cdot\dfrac{5}{12} =\dfrac{5,76\cdot 5}{12} =0,48\cdot 5=2,4\\\\3)\\\\8,75+2,4-13,009=11,15-13,009=-1,859[/tex]