Помогите решить срочно! (6k-8n)(3k+4n)=?

(d+5)(d-5)-(d-7)^2=?

6(m^2-3m)^2+9m^2(5+4m)-6(m^2-9)(m^2+9)=?
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^2 - обозначает 2 степень.
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