а)(9c²+d²)(3c-d)(3c+d)=81c⁴-729c²+9c²d²-81d²
б)(5x⁴-7y²)(5x⁴+7y²)=25x8-49y⁴
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а)(9c²+d²)(3c-d)(3c+d)=81c⁴-729c²+9c²d²-81d²
б)(5x⁴-7y²)(5x⁴+7y²)=25x8-49y⁴