Question

11. Determinați, în fiecare caz, numerele naturale x, știind că:
a) x+ 5 < 8
b) x+3 <11 ,x<11-3
c) x-7<13
d) x-3<6
e)4+x mai mare sau egal 10
f) 2+x mai mare sau egal 12
g)x+17>23
h) x+ 21 mai mic sau egal 43
i) 4× X < 2
j)3× X mai mare sau egal 33
k) x: 2 < 7
l) x:4 mai mare sau egal 2
m) x÷ 3<5
n) x : 6 mai mare sau egal 4
o) 3 × X +11 < 44
p) 3+7× X mai mare sau egal 52
r) 5× X - 23 mai mic sau egal 22
s) 6× X - 18 mai mic sau egal 72
t) 3^X mai mare sau egal 81
u) 10^X < 100000
v) 2 la puterea 2×X +1 mai mic sau egal 128
x) 4 la puterea 3 × X - 5 > 256

Dau coroana !!! Plssss!!!! Help !!!!​

Answer 1

a) x < 8-5

x < 3

S ={ 0,1,2}

b) x < 8

S ={0,1,2,3,4,5,6,7 }

c) x < 20

S ={0,1,2,3....19}

d) x <9

S ={ 0,1,2,3...8}

e) 4+x >/ 10

x >/ 6

S={6,8,9,10,....}

f) 2+x >/ 12

x >/ 10

S={10,11,12...}

g)  x > 6 S={7,8,9,10...}

h) x +21 </ 43

x </ 22

S= {0,1,2,3,...22}

i) x < 2 S ={0,1}

j) 3x >/ 33

x >/ 11 S={11,12,13...}

k) x < 14

S={0,1,2,3...13}

l) x : 4 >/ 2

x >/ 8

S={8,9,10,...}

m) x < 15

S={01,2,3,4,...14}

n) x : 6 >/ 4

x >/ 24

S={24,25,26...}

o) 3x < 33

x < 11

S={0,1,2,3,...10}

p) 3+7x >/ 52

7x >/ 49

x >/ 7

S={ 7,8,9,...}

r) 5x -23 </ 22

5x </ 45

x </ 9

S={0,1,2,3..9}

s) 6x -18 </ 72

6x </ 90

x </ 15

S={0,1,2,...15}

t) 3^x = 3^4

x = 4

u) 10^x < 10^5

x < 5

S={ 0,1,2,3,4}

v) 2^(2x+1) </ 128

2^(2x+1) </ 2^7

2x+1 </ 7

2x </ 6

x </ 3

S={ 0,1,2,3}

x) 4^(3x-5) > 4^4

3x-5 > 4

3x > 9

x > 3

S={4,5,6,...}