53
pasuxi: 26.
pirobas akmayofilebs 52,
63 da 74.
sinjvis xerxi. cxrilSi CavweroT yvela SesaZlo ricxvi da SevarCioT is, ro-
melic amocanis pirobas akmayofilebs
xy
yx
namravli
jami
15
51
765
66
26
62
1612
88
37
73
2701
110
48
84
4032
132
59
95
5605
154
b) vTqvaT, saZiebeli orniSna ricxvia
xy=10
x+y, sadac
y=x–3, anu
xy=11
x–3. misi
momdevno ricxvia 11x–2. pirobiT,
Z
[
\
]
]
]
]
(11
x–3)(11
x–2)
>2750
11x–3+11x–2<150,
saidanac miaxloebiT x∈(4,99;7,05).
x da y cifrebia. amitom, x=5, 6 an 7.
pasuxi: 52, 63 an 74.
sinjvis xerxi. cxrilSi CavweroT yvela SesaZlo ricxvi da maTgan SevarCioT
misaRebi.
xy
momdevno namravli
jami
30
31
930
61
41
42
1722
83
52
53
2756
105
63
64
4032
127
74
75
5550
149
85
86
7310
171
96
97
9312
193
g) marTkuTxedis sigrZisa da siganisTvis SemoviRoT aRniSvnebi
x+2 da
x. pirobiT,
Z
[
\
]
]
]
]
x(
x+2)
<224
x
2
+(x+2)
2
>361,
saidanac miaxloebiT x∈(12,4; 14). pirobiT x naturaluria, e. i. x=13.
pasuxi:
13 da 15.
sinjvis xerxi.
marTkuTxedis gverdebi
farTobi
diagonali
3
1
3
√
10
4
2
8
√
20
5
3
15
√
34
6
4
24
√
52
7
5
35
√
74
8
6
48
10
9
7
63
√
130
10
8
80
√
164
54
11
9
99
√
202
12
10
120
√
244
13
11
143
√
290
14
12
168
√
340
15
13
195
√
394
16
14
224
sinjva SevwyviteT, rogorc ki farTobi gaxda 224sm
2
. SeiZleba sinjva
naxtomebiTac ganvaxorcieloT. amocanis pirobebs akmayofilebs erTi SemTxveva,
roca gverdebia 15 sm da 13sm.
vip
3
mricxveli unda iyos sruli kvadrati:
(2x+3)
2
an (2x–3)
2
, e. i. a=12, an a=–12.
4
diskriminanti D=a
2
+4>0. amrigad, a-s nebismieri mniSvnelobisTvis samwevrs
aqvs ori nuli.
5
cxadia, y = x
2
– 4
x–2 funqciis gansazRvris ares
x=2 wertili ar ekuTvnis.
SevkvecoT (x–2)-ze, miviRebT: y=x+2, x≠2. es aris wrfe, romlidanac `amogdebulia~
(2; 4) wertili.
6
x
2
+x+10>0 nebismieri x-isTvis, amitom nebismieri x amonaxsns warmoadgens.
7
magaliTad, a) (x+3)(x–5)>0, b) x(x–6)≤0,
g) x– 6
x ≤0,
d) x
x– 6 ≤0,
e) 1
x(
x– 6) <0.
9
(–1;0) aris parabolis wvero, ordinatTa RerZs kveTs (0;–2) wertilSi. amitom
Stoebi qveviTaa mimarTuli _ a<0; c=–2.
10
y=(x+2)
2
parabolis wveroa (–2; 0), manZili saTavemde 2 erTeulia.
11
saaTebis isari 9 saaTis niSnulidan gadax rilia 3 danayofiT
(yovel 12 wuTSi is gadaad
gildeba 1 danayofiT) ∠AOB-s 12
danayofi Seesabameba, TiToeul danayofs _ 6
0
-iani centruli
kuTxe. amrigad, ∠
AOB=72
0
.
gameoreba
1
Semcirebuli marTkuTxedis gverdebi iqneba 20–2x da 15–2x, farTobi _
(20–2x)(15–2x). x-is dasaSvebi mniSvnelobebia 0≤x<7,5.
2
I momatebis Semdeg fasi gaxda 1200⋅100+x
100 lari, II momatebis Semdeg _
1200(100+
x)
100
⋅100+
x
100 lari, anu 1200⋅
(
100+x
100
)
2
=0,12
x
2
+24x+1200.
55
3
pirobiT, parabolis Stoebi qveviT yofila mimarTuli _ a<0. maSin a–1<0,
amitom |a–1|=1–a. maSin |a–1|=3 gantolebis tolfasia 1–a=3, a=–2.
4
wrfiv gantolebas uamravi fesvi aqvs, Tu a
2
–4=0 da a
2
+2
a=0. orive
gantolebas akmayofilebs a=–2. x
2
+2x+1 kvadratuli samwevris diskriminati 0-ia,
mas erTi nuli aqvs: x=–1.
5
wrfiv gantolebas ara aqvs fesvi, Tu 9a
2
–4=0 da 3a
2
–2a≠0, saidanac a=– 23.
y=– 23
x
2
+2x funqciis nulebia x=0 da x=3.
6
parabolis wveroebia (2; –1) da (7; –10). maT Soris manZilia
√
(7–2)
2
+(–10+1)
2
=
√
106 .
7
mniSvneli dadebiTia nebismieri x-isTvis. utolobas ar eqneba amonaxsni, Tu
nebismieri x-sTvis 3x
2
+2ax+(a+6)>0, anu D=a
2
–3(a+6)<0, saidanac a∈(–3; 6).
8
a) 5x
2
+14x–3≥0, saidanac x∈(–∞;–3]∪
[
1
5; +∞
)
,
b)
–3
x
2
–2x+5≥0, saidanac x∈
[
–53; 1
]
,
g) –x
2
+3
x–4≥0, utolobas amonaxsni ara aqvs,
d) x
2
–4≥0, x∈(–∞;–2]∪[2;+∞).
9
a) |x+5|>0 nebismieri x≠–5-isTvis. amrigad, es mniSvneloba unda gamovricxoT
x–3>0 utolobis amonaxsnTa simravlidan. vRebulobT
x>3,
x∈(3;
+∞).
b) |x–3|>0 nebismieri x≠3-isTvis. amrigad, x+5>0 utolobis amonaxsnebidan unda
gamovricxoT x=3. miviRebT simravles (–5; 3)∪(3; +∞).
g) radgan |x
2
+2x–3|≥0 nebismieri x-sTvis, amitom, mocemuli utolobis amonax-
snebs miviRebT x
2
+2x–3 samwevris nulebisa da x+4≤0 utolobis amonaxsnTa simravlis
gaerTianebiT. samwevris nulebia –3 da 1, x+4≤0 utolobis amoxsniT vRebulobT:
x∈(–∞
; –4]
. amrigad,
x∈(–∞
;–4]∪{–3
; 1}.
d) |x
2
–9|>0 nebismieri x≠3 da x≠–3-isTvis. amrigad, vxsniT utolobas x–10<0 da
vRebulobT pasuxs:
x∈(–∞;–3)∪(–3;3)∪(3;10).
10
b)
2(
x–2)
(
x– 32
)
(x–2)|x|
≥0
, saidanac x–32≥0, x≠2, x≠0.
pasuxi:
x∈
[
3
2; 2
)
∪
(2;+∞).
e) radgan
√
5 –3<0, amitom vRebulobT: (x–2,5)(x+2)≥0.
x∈(–∞;–2]∪[2,5;+∞).
v) 0<
√
17
5–
<1, amitom
√
17
5–
– 1<0 da vRebulobT: 4x
2
–1<0. pasuxi:
(–
1
2;
1
2
)
.
11
piroba `3x
2
–4kx+3>0 da kx
2
–2kx+3>0 nebismieri x-isTvis~ Sesruldeba, Tu am
samwevrebis diskriminantebi uaryofiTia da k>0:
Z
[
\
]]
]]
k>0
4k
2
–9<0
k
2
–3k<0, saidanac k∈
(
0; 32
)
.