Предмет: Алгебра, автор: bbb59

Срочно!!! Дам 55 балов за 2 задания

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Ответы

Автор ответа: NotStupid999
1

Ответ: от 0 до +бесконечности

Объяснение: ну первое просто выбрать

2

x * ( x -3)  ≤ 0

x * ( x -3) = 0, тогда x = 0                x = 0

                                 x - 3 = 0           x = 3

x  > 2

Ну сдесь ты рисуешь рисунок, но это не обязательно

х принадлежит(значок) от 0 до +бесконечности


NotStupid999: в 1 задании б, сори забыл
Автор ответа: Universalka
1

\displaystyle\bf\\\left \{ {{x^{2} -16\geq 0} \atop {x^{2} -25 < 0}} \right. \\\\\\\left \{ {{(x-4)(x+4)\geq 0} \atop {(x-5)(x+5) < 0}} \right.

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\                /////////////////////////////

------------( - 5)------------[ - 4]------------[4]------------(5)----------

                   ////////////////////////////////////////////////

Ответ  :  на рисунке  б )

\displaystyle\bf\\2)\\\\\left[\begin{array}{ccc}x^{2} -3x\leq 0\\x > 2\end{array}\right \\\\\\\left[\begin{array}{ccc}x\cdot(x-3)\leq 0\\x > 2\end{array}\right

               //////////////////////////////////////

--------------[0]-------------(2)--------------[3]------------

                                      //////////////////////////////////

Ответ  :   x ∈ [ 0 ; + ∞)

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