Х+1 1\8х=119
8\8х+9\8х=119
17\8х=119
х=119\1*8\17
х=56т-во 2 вагоне.
1 1\8х=9\8*56\1=63т-в 1 вагоне.
A)x+2/3=0,1
х=0,1-2/3
х=-17/30
в)5/16-x=5/2
х=5/16-5/2
х=-2 3/16
г)-7/9-x=-13/18
х=-7/9-(-13/18)
х=-1/18
((7/5-9/2+9/7+5/7)×3/11)/((5/2-275/100)×1/2-5/2)=(((7×14)-(9×35)+(14×10))/70×3/11)/((((5×50)-275)/100)×1/2-5/2)=(((98-315+140))/70×3/11)/(((250-275)/100)×1/2-5/2)=(-77/70×3/11)/(-(25/100×1/2)-5/2)=(-21/70)/((-250-500)/200)=21/70×200/750=3<span>×20/75=60/75=12/15</span>