Упростите выражения:
а) -3х(2-x)+(3x+1)(x-2);
б) 3(2х-1)^2+12х;
в) (х+3)^2-(х-2)(х+2).
а) -3х(2-x)+(3x+1)(x-2);
б) 3(2х-1)^2+12х;
в) (х+3)^2-(х-2)(х+2).
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