сократите дробь а3+а2-а1:а2-2а+1
а3+а2-а1:а2-2а+1 = 5a - 1|2 - 2a + 1 = 3a + 1|2
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а3+а2-а1:а2-2а+1 = 5a - 1|2 - 2a + 1 = 3a + 1|2