Предмет: Алгебра, автор: Эфф

решите неравенства:                                                                                                                       3x + 5 > 9x - (5 - 2x) .                                                                                                                                  1 - x < 6x - (3x - 1).                                                                                                                                                     6 - 3x < 19-(x - 7).                                                                                                                                        17 - (x + 2)>12x - 11.                                                                              

Ответы

Автор ответа: Cruciatus
2

1) 3x+5>9x-(5-2x)
3x+5>9x-5+2x
3x-9x-2x>-5-5
-8x>-10
x<1.25
x принадлежит (-бесконечность;1.25)

2) 1 - x < 6x - (3x-1)
1-x<6x-3x+1
-x-6x+3x<1-1
-4x<0
x>0
x принадлежит (о; + бесконечность)

3) 6-3x<19-(x-7)
6-3x<19-x+7
-3x+x<19+7-6
-2<20
x>-10
x принадлежит (-10; + бесконечность)

4) 17-(x+2)>12x-11
17-x-2>12x-11
-x-12x>-11-17+2
-13x>-26
x<2
x принадлежит (-бесконечность;2)

 

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