Question

9. Sa se afle numarul natural x:
a) 45:x=15
b)36:x=12
c) 20:(x+2)=2
d) [6+3x(5-2)]:x=5
e) 2x+8=24
f)15+3x=21
g) 24-5x=4
h)6x-18=54
i) 8x:6=8
j)72:(x+1)=9
k)(14+2x6):(13x)=2

Answer 1

Răspuns:

a) 45:x=15

x=45:15=>x=3

b)36:x=12

x=36:12=>x=3

c) 20:(x+2)=2

x+2=20:2=>x=10-2=>x=8

d) [6+3x(5-2)]:x=5

6+3·3=5x=>x=15:5=>x=3

e) 2x+8=24

2x=24-8=>x=16:2=>x=8

f)15+3x=21

3x=21-15=>x=6:3=>x=2

g) 24-5x=4

5x=24-4=>x=20:5=>x=4

h)6x-18=54

6x=54+18=>x=72:6=>x=12

i) 8x:6=8

8x=6·8=>x=48:8=>x=6

j)72:(x+1)=9

x+1=72:9=>x=8-1=>x=7

k)(14+2x6):(13x)=2

26:13x=2

13x=26:2=>x=13:13=>x=1

Answer 2

Răspuns:

a) x = 45 : 15 => x = 3

b) x = 36 : 12 => x = 3

c) x+2 = 20 : 2 ; x+2 = 10 => x = 8

d) x = (6 + 3 × 3) : 5 => x = 3

e) 2x = 16 => x = 8

f) 3x = 6 => x = 2

g) 5x = 20 => x = 4

h) 6x = 72 => x = 12

i) 8x = 48 => x = 6

j) x+1 = 72 : 9 ; x+1 = 8 => x = 7

k) 13x = 26 : 2 ; 13x = 13 => x = 1