выполни умножение
а) (a+1)*(a+1)
в) (2+y)*(y+3)
д) (1+x)*(1-x)
ж) (x-y)*(x+y)
и)(2a+b)*(a+2b)
б) (x+1)*(x+2)
г) (a+b)*(a+b)
e) (a-2)*(3-a)
з)(a-b)*(a+b)
к) ( 3x+2y)*(3x+2y)
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