Question

4. Rezolvaţi în mulţimea numerelor naturale ecuațiile:
a) 3.(x+7)=129; b) 5 (x+9)=175;
d) 15.(18-x) = 180; e) 63:(x-5)=7;
g) (x-4):15 = 16; h) 14x + 28x = 588.
c) 18.(x-11)=144;
) 156:(2x + 1) = 52;​

Answer 1

Răspuns:

3(x+7)=129

x+7=129/3

x=43-7

x=36

5(x+9)=175

x+9=175/5

x=35-9

x=26

18(x-11)=144

x-11=144/18

x=8+11

x=19

15(18-x)=180

18-x=180/15

x=18-12

x=6

63:(x-5)=7

x-5=63÷7

x=9+5

x=14

(x-4)÷15=16

x-4=16×15

x=240+4

x=244

14x+28x=588

42x=588

x=588÷42

x=14

156÷(2x+1)=52

2x+1=156÷52

2x=3-1

x=2÷2

x=1