49
15
a) mocemulis tolfasi sistemaa
Z
[
\
]
]
]
]
(x–100)(x+3)>0
x(
x–140)≤0,
saidanac x∈(100; 140].
b)
Z
[
\
]
]
]
]
(x–2,4)(x+1,5)≥0
(
x–3)(
x+2)
<0,
saidanac
x∈
(–2
; –1,5]∪[(2,4
; 3)
.
g)
Z
[
\
]
]
]
]
8
(
x– 12
)(
x+ 54
)
<0
x(x–2)>0, x∈
(
– 54; 0
)
.
d)
Z
[
\
]
]
]
]
2
(
x+ 12
)
(x+2)>0
(
x+3)
2
≥
0.
II utolobas akmayofilebs x-is nebismieri mniSvneloba. sistemis amonaxsni emTx-
veva I utolobis amonaxsns: (–∞; –2)∪
(
– 12; +∞
)
.
16
a)
Z
[
\
]
]
]
]
2x+3≥0
x
2
–4≥0, x∈[2; +∞).
b)
Z
[
\
]
]
]
]
3x
2
–10x+3>0
4
x–
x
2
≥
0,
saidanac
Z
[
\
]
]
]
]
3(x–3)
(
x– 13
)
>0
x(
x–4)≤0,
x∈
[
0; 13
)
∪
(3; 4].
g)
Z
[
\
]
]
]
]
x–4≥0
Z
[
\
]
]
]
]
x≥4
9–(
x–3)
2
>0
x(
x–6)
<0,
x∈[4
; 6)
.
d) aRsaniSnavia, rom Tu 2x
2
+x–15≥0, maSin mniSvneli nulis toli ar xdeba. metic,
is ar aris 1-ze naklebi. amitom gansazRvris aris dasadgenad sakmarisia amovxsnaT
utolobaTa sistema:
Z
[
\
]
]
]
]
(x+1)
2
–x≥0
2x
2
+x–15≥0. pasuxi: (–∞; –3]∪
[
15
2 ; +∞
)
.
e)
Z
[
\
]
]
]
]
11x–9–2x
2
≥
0
2
(
x– 92
)
(x–1)≤0
x
2
–6x+9>0
(
x–3)
2
>0.
II utolobas akmayofilebs nebismieri x, garda x=3, miviReT,
x∈[1;3)∪(3;4,5].
v)
Z
[
\
]
]
]
]
9–4x
2
≥
0
x≥0,
saidanac
x∈[0; 1,5].
z)
Z
[
\
]
]
]
]
x≥0
Z
[
\
]
]
]
]
x≥0
√
x ≠3
x≠9.
pasuxi: [0;9)∪(9;+∞).
T)
Z
[
\
]
]
]
]
x+3≥0
Z
[
\
]
]
]
]
x≥–3
√
x+3≠5 x+3≠25.
pasuxi:
[–3; 22)∪(22; +∞).
aRsaniSnavia, rom am savarjiSoebis amoxsnis gzebi arastandartulia da moiTxovs
moswavlisgan naswavli masalis kombinirebulad gamoyenebis unars.
50
17
ormagi utoloba tolfasia sistemis:
a)
Z
[
\
]
]
]
]
x
2
–9x≤0 b)
Z
[
\
]
]
]
]
x
2
–9<0
g)
Z
[
\
]
]
]
]
x
2
–3x–4<0
d)
Z
[
\
]
]
]
]
x
2
+2x–3<0
x
2
–4>0
x
2
–1≥0
x
2
–3x+2≥0
x
2
+2x+1>0.
18
TiToeul SemTxvevaSi CavweroT mocemulis tolfasi ormagi utoloba da
Semdeg utolobaTa sistema:
a) –3
2
–2x<3,
Z
[
\
]
]
]
]
x
2
–2x–3<0
x
2
–2x+3>0.
II utolobas akmayofilebs
x-is nebismieri mniSvneloba, I-is amonaxsnTa simravlea
(–1;3).
b) –6
2
–10<6,
Z
[
\
]
]
]
]
x
2
–16<0
x
2
–4>0,
saidanac vRebulobT: x∈(–4; –2)∪ (2;4).
g) –2
2
–x–4<2,
Z
[
\
]
]
]
]
x
2
–x–6<0
x
2
–x–2>0,
saidanac x∈(–2;–1)∪(2;3).
d) –3
2
–3x–1<3,
Z
[
\
]
]
]
]
x
2
–3x–4<0
x
2
–3x+2>0, saidanac x∈(–1; 1)∪(2;4).
19, 20 savarjiSoebiT moswavles unviTardeba iseTi donis saazrovno unar–Cvevebi,
rogoricaa analizi, sinTezi. mas mouwevs parametrebis yvela mniSvnelobis ganxilva,
maTgan iseTis SerCeva, romelic amocanis pirobas akmayofilebs, parametris SerCeuli
mniSvnelobisTvis amocanis amonaxsnis povna.
`
19
utolobaTa sistema ase gadavweroT:
Z
[
\
]
]
]
]
(x–6)(x–3)≤0
x≥ 3a
2
I utolobis amonaxsnTa simravlea [3;6]. Tu 3a
2
>6, anu a>4, maSin utolobas amonaxsni ara aqvs.
es SemTxveva suraTze ase gamoisaxeba
Tu 3a
2 =6, anu a=4, sistemas aqvs erTaderTi
amonaxsni: x=6.
Tu a<4, sistemas aqvs uamravi amonaxsni, amas-
Tanave
Tu 3<3a
2 <6, maSin amonaxsnTa simravlea
[
3a
2 ; 6
]
,
Tu 3a
2 ≤3, maSin amonaxsnTa simravlea [3;6].
20
Z
[
\
]
]
]
]
x(x–4)≥0
x(x+a)≤0.
sistemis I utolobis amonaxsnia (–∞; 0]∪[4; +∞).
cxadia, am sistemas x=0 akmayofilebs a-s nebismieri mniSvnelobisTvis, e. i. siste-
mas yovelTvis aqvs erTi mainc amonaxsni.