Решите систему неравенств: Ответ должен получится (-2;0)[tex] \left \{ {{21x^{2} +39 x-6\ \textless \ 0,} \atop { x \ \textless \ 0;} \right. [/tex]
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21x²+39x-6<0(3x+6)(7x-1)<0
x=-2 x=1/7
+ - +
---------(-2)---------(1/7)---------
x∈(-2,1/7) с учетом x<0
x∈(-2,0)