3.8*(-23/4)+13.3/5:1.7/(4.3-7.85):7.1=-3.8*5,75+2,66:1.7/(-3,55):7.1=
=-3.8*5,75+2,66:1.7/(-3,55):7.1=-21,85-2,66*3,55/1,7*1/7,1=-21,85-2,66*0,5/1,7==-21,85-1,33/1,7=-21 85/100-133/170=-21 17/20-133/170=-21 289/340-266/340=
=-21 555/340=-22 215/340=-22 43/68

2)4/5-0.9-0.225)*8/13/2/5:8=

скобка не понятная
3)6.2/3*(-1.3)+16.5:(-2.3/4)/1/3-8/15=-8,06/3-16.5:0,575/1/3-8/15=
=-806/300-16,5/0,575/3-8/15=-403/150-5,5/0,575-80/150=-483/150-5500/575=
=-161/50-220/23=-3 11/50-9 13/23=-3 253/1150-9 650/1150=-12 903/1150

4)4/5:2.2/3-3.3/4/1/6-1/15=4/5*3/2,2-3,3/24-1/15=4/5*30/22-33/240-1/15=
=2/1*6/11-11/80-1/15=12/11-11/80-1/15=12/11-165/1200-80/1200=12/11-245/1200=1 1/11-49/240=1 240/2640-539/2640=1-299/2640=-2341/2640

;№600.вычислить:1)(-5.6)*9/(-1.5)/(-2.7)*(-0.8)*(-1.4)=5.6*6/(-2.7)*0.8*1.4=
=-37,632/2,7=-37632/2700=-9408/675=-3136/225=-13 211/225


2)(-12.1)*(-9.3)/(3.1)*3.3-(-1.1)=(-12.1)*(-3)*3.3-(-1.1)=119,79+1,1=120,89


3)(-3.2-4)*8.1*(0.14-0.61)/0.9*(-3.2)*(0.75)=(-7,2)*8.1*(-0.47)/0.9*(-3.2)*(0.75)=
=8*8.1*0.47*(-3.2)*0.75=-73,0944

4)(3.5-5.4)*(3.4-1.2)/(4.8-7)*1.9=(-1,9)*2,2/(-2,2)*1.9=1,9*1,9=3,61