Question

Срочно пожалуйста 9 КЛАСС срочно прям

Answer 1

у/3-у/7<2|*21;

4-у/2<0|*2;

21у/3-21у/7<42;

8-у<0;

7у-3у<42;

-у<-8|*(-1);

4у<42;

у>8;

у<10,5;

у>8;

9

Answer 2

$\displaystyle\bf\\\left \{ {{\dfrac{y}{3}-\dfrac{y}{7} < 2 } \atop {4-\dfrac{y}{2} < 0}} \right. \\\\\\\left \{ {{\dfrac{y}{3}\cdot 21-\dfrac{y}{7}\cdot21 < 2 \cdot21} \atop {4\cdot 2-\dfrac{y}{2} \cdot 2 < 0\cdot 2}} \right. \\\\\\\left \{ {{7y-3y < 42} \atop {8-y < 0}} \right. \\\\\\\left \{ {{4y < 42} \atop {-y < -8}} \right. \\\\\\\left \{ {{y < 10,5} \atop {y > 8}} \right. \ \ \ \Rightarrow \ \ \ y\in \Big(8 \ ; \ 10,5\Big)\\\\\\Otvet \ : \ 9,10$