Упростите выражения:
1) (5а+х) (5а-х) +3а (а-х);
2) (3х+4у)^2 - (3х-4у) (3х+4у) - (х+у) (х-у)
3) (2а+6в) (6в-2а) - (2а+6в)^2
4) (8м-н) (н+8м) - (м+н) (м-н)
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