а В а р и а н т 2 1. (За² +7a-5)-(За² +1) 2. (Sa+3)+(-2a² +a+7)= 3. x² - 3xy+y² - (x² - y²) = 4. (x+6y)+(3-6y)= 5. (a-b+c)+(a-c) - (a-b - c) =​
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