Предмет: Алгебра, автор: АнонХикк

 1.Найдите точки пересечения графика функции у=х*2+3x с осью OX.

( Решение)-Ответ:

2.Докажите неравенство m*2-mn+n*2>=(больше и равно) mn 

( Решение) - Ответ:

3.Найдите значение выражения (√7+2√6+√7-2√6)*2

(Решение) -Ответ:

4.Оцените периметр прямоугольника со сторонами bcm и аcm, если 4,4<а<4,5; 6,3<b<6,4

(Решение) -Ответ:

( * -степень)

Решайте правильно, пожалуйста! Мне не нужны неверные или выдуманные ответы. 

Ответы

Автор ответа: bibigonochka
0

1) приравниваем уравнение к нулю

х^2+3x=0

x(x+3)=0

х=0 либо х+3=0

                  х=-3.

Т.е. (0;0) (0;-3)

2)  реши неравенство

3) раскраыем скобки и каждое из чисел возводим в квадрат

   7+4*6+7-4*6=14

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