Упростите выражение:
1) (а+в)^2-(а-в)^2;
2) (м+4)
^2-4(м+1)^2;
3) 3(2-у)^2+4(у-5)^2;
4) 5(3-5х)^2-5(3х-7)(3х+7);
5) (а+1)^2+3(а-1)^2-5(а-1)(а+1);
6) (х-1)^2-4(х+1)^2-6(х+1)(х-1);
2.Выполните действия:
1) ((3а+в)^2-(а+3в)^2)*2ав;
2) ((х^2+2х)^2+(2х^-х)^2)/5х^2
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