Сложите почленно неравенства:

 а) 4а+ b>2b+1 и a-b>3-2b 

 б) 7,5а - 11 < 9,6b + 19 и 15 - 7,5а <8-5,3b

 c) 15,7+8b>3a -6 и 4,3-8b>7,9+2а 

 

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