а) a + 1 < 2b + 1; a + 1,6 < 2b + 3,2; a - 6 < 2b - 12; a - 1 + 1/2 < 2b - 1/2.
б) a - 2 < 2b - 4; -4 < 2b - a - 2; 4 1/5 < 2b - a - 2; 5.7 < 2b - a - 2.
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Answers & Comments
а) a + 1 < 2b + 1; a + 1,6 < 2b + 3,2; a - 6 < 2b - 12; a - 1 + 1/2 < 2b - 1/2.
б) a - 2 < 2b - 4; -4 < 2b - a - 2; 4 1/5 < 2b - a - 2; 5.7 < 2b - a - 2.