1. упростите выражение
a) (2x + 1)(x-1)
б) (3- y²)(xy - 4)
в) a² +(2-a)(a+5)
г) (n-1)²(n²+n-2)

2. разложие на множители
а) xy+3y+xa+3a
б) 2a-ab+6-3b
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