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 Точки это умножение

А) 1. 4000 - x * 8 = 160

- 8 * х = 160 - 4000

- 8 * х = - 38 40

х = 3840 / 8

х = 480

2. 4000 - x * 2 = 160

2 * х = 4000 - 160

х = 38 40 / 2

х = 1920

3. 4000 - x * 4 = 160

4 * х = 38 40

х = 3840 / 4

х = 960

б) y - 400 * 3 = 800

у = 800 + 1200

у = 2000

2. y - 400 * 4 = 800

у = 800 + 1600

у = 2400

3. 400 * 3 - y = 800

у = 1200 - 800

у = 400

в) 1. d / 4 = 4228 / 7

7 * d = 42 28 * 4

d = 4228 * 4 / 7

d = 604 * 4

d = 2 416

2 / d / 8 = 4228 / 7

d * 7 = 4228 * 8

d = 4228 / 7 * 8

d = 4832

3. d / 4 = 2114 / 7

7 * d = 2114 * 4

d = 2114 * 4 / 7

d = 1208