Ответ:
а) 5а + 7b – 2а – 8b = 5а-2а + 7b-8b = 3a-b
б) 3 (4х + 2) – 5 = 12x+1
в) 20b — (b – 3) + (3b — 10) = 20b-b+3+3b-10=b (20-1+3)-7= 22b-7
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Ответ:
а) 5а + 7b – 2а – 8b = 5а-2а + 7b-8b = 3a-b
б) 3 (4х + 2) – 5 = 12x+1
в) 20b — (b – 3) + (3b — 10) = 20b-b+3+3b-10=b (20-1+3)-7= 22b-7