Ответ:
2 1/3 ≤ y ≤ 4 1/3
Объяснение:
{x+y+z=10
{z-x=3 ⇒ z=x+3
x+y+x+3=10
2x+y=7
2x=7-y
x≤y≤x+3
7-y≤2y≤2x+6
7-y≤2y≤7-y+6
7-y≤2y≤13-y
{7-y≤2y ⇒ 3y≥7 ⇒y≥7/3
{2y≤13-y ⇒3y≤13 ⇒ y≤13/3
7/3=2 1/3
13/3=4 1/3
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Answers & Comments
Ответ:
2 1/3 ≤ y ≤ 4 1/3
Объяснение:
{x+y+z=10
{z-x=3 ⇒ z=x+3
x+y+x+3=10
2x+y=7
2x=7-y
x≤y≤x+3
7-y≤2y≤2x+6
7-y≤2y≤7-y+6
7-y≤2y≤13-y
{7-y≤2y ⇒ 3y≥7 ⇒y≥7/3
{2y≤13-y ⇒3y≤13 ⇒ y≤13/3
7/3=2 1/3
13/3=4 1/3
2 1/3 ≤ y ≤ 4 1/3