решите 3 и 4 пример во втором столбике. Created by tea74. algebra-ru

решите 3 и 4 пример во втором столбике...

TARTILLO

Verified answer

X²≤100 (x-10)(x+10)≤0
методом интервалов...

/////////////////
+ - +
----------(-10)-------------(10)--------

х∈[-10,10]

4x²>25 4(x-5/2)(x+5/2)>0
методом интервалов...

///////////////// /////////////////
+ - +
----------(-5/2)-------------(5/2)--------

х∈(-∞,-5/2)∪(5/2, +∞)

1 votes Thanks 1

KarinaYouchi А) x^2≤100
x^2-100=0
x^2=100
x1=10 x2=-10
+ - +
///////////////////////////
-----------[-10]------------------------[10]------------
Ответ:[-10;10]
б) 4x^2>25
4x^2-25=0
4x^2=25
x^2=25\4
x1=5\2 x2=-5\2
+ - +
////////////// /////////////////
------------(-5\2)----------------------(5\2)-----------------
Ответ:(-∞;-5\2)U(5\2;+∞)

3 votes Thanks 1

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