№2
упростите выражение
(x+5)^2-5x(2-x)
16y+2(y-4)^2
№3 разложите на множетили
81-a^2
5x^2-y^2
3x^2-6xy+3y^2
(x-2)^2-16
81y^4-x^4
№4 упростите выражение
(a^2+4a)^2-a^2(a-2)(a+2)-4a^2(2a-1)
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