Решите неравенства 1) x^2-8x+12<0
2)x^2-6x> или=0
3)2x^2+x-1>0
4)3-2x-x^2> или=0
решите неравенство методом интервала
1)(x-12)(x+11)<0
2)(x+1,7)(x-9)(4.2+x)<0
3)(6x+1)(x-14)<0
4)(2x-3)(x+4)>0
срочно надо очень!!!!
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