найдите сумму неравенств : 1) 5>-8 и 8>5 2) 3x+y

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найдите сумму неравенств :
1) 5>-8 и 8>5
2) 3x+y<2x+1 и 3y-2x<14-2x

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nafanya2014

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Неравенства одинаковых знаков( оба знака больше или оба знака меньше) можно складывать:
1) 5>-8
8>5
----------------
13 > - 3

Ответ. 13 > - 3

2) 3x+y<2x+1
3y-2x<14-2x
---------------------------
3x+y+3y-2x < 2x +1 +14 - 2x
x+4y < 15

Ответ. x+4y < 15

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