1.Բաղդատել թվերը, եթե
ա) f(x) = x8
f(3) և f(5)
f(3) = 38
f(5) = 58
f(3) < f(5)
f(-11) և f(12)
f(-11) = -118
f(12) = 128
f(-11) < f(12)
բ) f(x) = x3
f(-2) և f(-7)
f(-2) = -23
f(-7) = -73
f(-2) > f(-7)
f(10) և f(12)
f(10) = 103
f(12) = 123
f(10) < f(12)
2.Լուծել հավասարումը
ա )x4=74
x = 7
3. Բաղդատել թվերըf(x) = x1/3
f(15) և f(14)
f(15) = 151/3
f(14) = 141/3
f(15) > f(14)
4.Լուծել հավասարումը
ա) 2x = 0,5
2x = ½
2x = 2-1
x = -1
բ) ( 1/3)x = ∛3
1/3 = 3-1
3-x = 31/3
-x = 1/3
x = -1/3
գ) 4x-1 = 2×8x-2
22x-2 = 2×23x-6
2x-2 = 1+3x-6
2x-3x = -6+2+1
-x = -3
x = 3
դ) 54x = (0,2)x-6
54x = 5-x+6
4x = -x+6
5x = 6
x = 1.2
ե) (0,125)3-x = 2 √2
2-9+3x = 2×20.5
-9+3x =1+0.5
3x = 10.5
x = 10.5/3
x=3.5
զ) (√0,5)2-x = 32
(√2-1)2-x =25
20.5x-1 = 25
0.5x-1 = 5
0.5x = 6
x =12
5. Լուծել անհավասարումը
ա) (1/4)x ≤ 64
(4-1)x = 43
x ≤ -3
բ) 3x+1 × 5x-2 < 27
x < 2
6. Հաշվել.
ա) log381
3x = 81
x = 4
lg0,001
10x = 0.001
x = -3
log1/749√7
(1/7)x = 49√7
x = -2.5
52log512
(52log512)2 = 122 = 144
log251/125
25x = 1/125
x = -1.5
բ)
2log26 -log29 = log236 – log29 = log24
2x = 4
x = 2
2log1/56 – 1/2log1/5400 – 4log1/5∜45 = log1/536 – log1/520 – log1/545 = log1/50.04
1/5x = 0.04
x = 2
(log536 – log512) ÷ log59 = log53 ÷ log59 = log93
9x = 3
x = 0.5
36log65 + 101-lg2 – 3log936 =
(25log0,26+4log0,56)1/lg18 =
7.Լուծել հավասարումը
log0,9(6x-23)=0
6x-23=0.90
6x-23=1
6x=24
x=4
8.Լուծել անհավասարումը
log2(x-5) ≥ 3
x-5 ≥ 23
x-5 ≥ 8
x ≥ 13
log3(x2+7x-5) < 1
x2+7x-5 < 3
x2+7x-8 < 0
D =49-4(-8)
D= 49+32
D=81
x1 = 1 x2 = -8
lg(7x+5) < 1+ lg3
lg(7x-5) – lg3 < 1
(7x+5)/3 < 10
7x+5 < 30
7x < 25
x < 25/7