4562 - х = 36 * 2
4562 - х = 72
х = 4562 - 72
х =4490
=================
4562 - 4490 = 36 * 2
72= 72
х - 3210 = 45 * 2
х - 3210 = 90
х = 90 + 3210
х = 3300
=================
3300 - 3210 = 45 * 2
90 = 90
5 (-1.4a+3)-(1-2.5)-4 (0.8a+3)=-7a+15-1+2.5-3.2a-12=-10.2a+4.5=
=-10.2*5/7+4.5=-39/14
16км:80 = 0,2 км (1%)
100%* 0,2= 20км