2.8*7.5-4.2*2.75=0.7*4*7.5+0.7*6*2.75=0.7*(4*7.5+6*2.75)=0.7*(30+ 16.5)= 32.55 0. 125*29*8=0. 125*8*29= 1*29=29

1.84/0.2/0.4= 1.84/(0.2*0.4)= 1.84/0.08=23

0.5*( 12.76- 1 1.76/ 1.2)=0.5*( 12.76-9.8) =0.5* 2.96= 1.48