Упростите выражение
1)
a) (2а-b)(2а+b)+b2
б) (x+7)2-10x
в) 9x2-(c+3x)(c-3x)
г) 5b2-(a-2b)2
2)
а)(a-c)(a+c)-(a-2c)2
б)(x+3)2-(x-3)2
в)(a+3c)2+(b+3c)(b-3c)
г)(x-4y)2+(x+4y)2
д)(x-3)(x+3)-(x+8)(x-8)
е)(2a+1)(2a-1)+(a-7)(a+7)​
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