Упростите выражение:
1) (3x-8y)^2+6x(9x+8y)
2) (-7x+2y)^2-14x(3x-2y)
3) (-5x-y)^2-10x(-7x+y)
4) (-8x+5y)^2-16x(-8x-5y)
5) y(7y+4x)-(2x+y)^2
6) y(7y+10x)-(-x-5y)^2
7) y(3y+16x)-(-8x-y)^2
8) y(-7y+6x)-(-3x-y)^2
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