Question

[Việt Nam Toca]

giúp mình với mn ơi :

tìm x thuộc N biết :

a) x -120 :30 =40

b (x-120) :35 = 5

c) (x + 100) . 4 =800

d) x.5 +10 .9 = 990

e) x.14 -x.2 =120

f)x.13 -x.10 = 240

g) 28.x -x.17-x=250

ai đúng m sẽ tick nha !!!

Answer 1

[Vũ Cao Minh⁀ᶦᵈᵒᶫ ( ✎﹏IDΣΛ亗 )]

\(x-120:30=40\)

\(x-120=40.30=1200\)

\(x=1200+120=1320\)

Vậy. \(x=1320\)

Answer 2

[KAl(SO4)2·12H2O]

a) x - 120 : 30 = 40

x - 4 = 40

x = 40 + 4

x = 44

b) (x - 120) : 35 = 5

x - 120 = 5.35

x - 120 = 175

x = 175 + 120

x = 295

c) (x + 100).4 = 800

x + 100 = 800 : 4

x + 100 = 200

x = 200 - 100

x = 100

d) x.5 + 10.9 = 990

5x + 90 = 990

5x = 990 - 90

5x = 900

x = 900 : 5

x = 180

e) x.14 - x.2 = 120

14x - 2x = 120

12x = 120

x = 120 : 12

x = 10

f) x.13 - x.10 = 240

13x - 10x = 240

3x = 240

x = 240 : 3

x = 80

g) 28.x - 17.x - x = 250

10x = 250

x = 250 : 10

x = 25