Преобразование целых выражений
Упростите выражение:
1. а) (2a+c) (a-3c) + 1(2c-a) = ?
б) (3х+у) (х+у) -4у(х-у) = ?
2. а) (2х-b) (3x+b) + (3b-x)(b+x) = ?
б) (c+2)(c-3)-(c+1)(c+3) = ?
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