Упростить выражения
(Х+8)^2-х(х+5)
2х(х+2)-(з-2)^2
(y+7)^2+(y+2)(y-7)
(a+1)(a-1)-(a+4)^2
(x-10)(9-x)+(x+10)^2
Срочно надо даю 20б
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