-0,81*(-5/9):(1,53:1,5-1,2)

[latex]-0,81*(- \frac{5}{9} ):(1,53:1,5-1,2)=-2,5 \\ \\ 1)1,53:1,5=1,02 \\ \\ 2)1,02-1,2=-0,18 \\ \\ 3)-0,81*(- \frac{5}{9})= \frac{81}{100}* \frac{5}{9}= \frac{9}{20} \\ \\ 4) \frac{9}{20}:(-0,18)= \frac{9}{20}: (-\frac{9}{50} )= \frac{9}{20}*(- \frac{50}{9} )=- \frac{5}{2}=-2,5 [/latex]