А) 4000-x.8=160; 4000-x.2=160; 4000-x.4=160 б) y-400.3=800; y-400.4=800; 400.3-y=800 в) d/4=4228/7; d/8=4228/7; d/4=2114/7

А )1. 4000 - x * 8 = 160 - 8 * х = 160 - 4000 - 8 * х = - 38 40 х = 3840 / 8 х = 4802. 4000 - x * 2 = 1602 * х = 4000 - 160 х = 38 40 / 2 х = 19203. 4000 - x * 4 = 160 4 * х = 38 40 х = 3840 / 4 х = 960 б) y - 400 * 3 = 800 у = 800 + 1200 у = 20002. y - 400 * 4 = 800у = 800 + 1600 у = 24003. 400 * 3 - y = 800у = 1200 - 800у = 400 в)1. d / 4 = 4228 / 77 * d = 42 28 * 4 d = 4228 * 4 / 7 d = 604 * 4 d = 2 416 2/ d / 8 = 4228 / 7d * 7 = 4228 * 8 d = 4228 / 7 * 8 d = 48323. d / 4 = 2114 / 7 7 * d = 2114 * 4 d = 2114 * 4 / 7 d = 1208