Question

va rog mult punctele a,c,d atat
msm

Answer 1

a)
3x(x-2)-x(2x-1)+20≥(x+3)²
3x²-6x-2x²+x+20≥x²+6x+9
x²-5x+20≥x²+6x+9
-5x-6x+20-9≥0
-11x+11≥0
x≤1

5(x+3)-7≤2(2x-1)+11
5x+15-7≤4x-2+11
5x+8-4x-9≤0
x≤1
Raspuns: au aceeasi multime de solutii

c)
(3x-5)/2=(x+1)/3<x-(1-3x)/6
9x-15-2x-2<6x-1+3x
7x-17<9x-1
-6<2x
x>-3

(x+2)/5-(2x-1)/2<3-x/10
2x+4-10x+5<30-x
-8x+9<30-x
-21<7x
x>-3
Raspuns: au aceeasi multime de solutii

d)
(x-3)/4-(2x-1)2≤5-(x+5)/2
x-3-4x+2≤10-x-5
-3x-1≤5-x
2x≥-6
x≥-3

5(x-1)+2(1-x)>x-26
5x-5+2-2x>x-26
3x-3>x-26
2x>-23
x>-23/2
Raspuns: nu au aceeasi multime de solutii