Приведите подобные слагаемые: 1) 2а - 3b + 4a - b =

2) 3x + 2y - 3x + 7 =

3) m - 5n + 8 - m - 5 =

4) 13c + d- 13d - c =

a) 8m + 14n - 9m - 15n + 7n =

б) 1/4а - 1/3а + 1/2а - 1/6а =
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