Question

COROANA : Rezolvati in multimea Z urmatoarele inecuatii : a) 2x-5<x; b) 3x+2 mai mic sau egal x; c) 5x+4 mai mic sau egal 3x+8 ; d) 5x+5 mai mic sau egal 3x+17; e) 2(3x+7) mai mic sau egal 38 ; f) 2x+9>3(x+1)... va rog frumos repede la 1 am pregatire !

Answer 1

a) 2x-x<5
x<5
x∈(-∞,5)

b) 3x-x≤-2
2x≤-2
x≤-2/2
x≤-1
x∈(-∞,-1]

c) 5x-3x≤8-4
2x≤4
x≤4/2
x≤2
x∈(-∞,2]

d) 5x-3x≤17-5
2x≤12
x≤12/2
x≤6≤
x∈(-∞,6]

e) 6x+14≤38
6x≤38-14
6x≤24
x≤24/6
x≤4

f) 2x+9>3x+3
2x-3x>3-9
-x>-6                 ·(-1)
x<6
x∈(-∞,6)