(4/1-3/2)×(5/4-15/2)×(-5/3)=
(4/1*2-3/2)×(5/4-15/2*2)×(-5/3)= = (8/2-3/2)×(5/4-30/4)*(-5/3)= =5/2×(-25/4)×(-5/3)=625/24
1)4/1-3/2=0,5 2)5/4-15/2=-6,25 3)0,5*6,25*(-5/3)=-625/120