Ответ:
( 2а + 5 b ) + ( 8 a - 11 b ) - ( 9 b - 5 a ) = 2a + 5b + 8a - 11b - 9b + 5a = 15 a - 15 b = 15 ( a - b)
(5а-2b)+3=3
(8a+11Б)+(9b-5a)=15
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Ответ:
( 2а + 5 b ) + ( 8 a - 11 b ) - ( 9 b - 5 a ) = 2a + 5b + 8a - 11b - 9b + 5a = 15 a - 15 b = 15 ( a - b)
Ответ:
(5а-2b)+3=3
(8a+11Б)+(9b-5a)=15