Question

Chỉ em bài 2 thôi ạ

Answer 1

a,15+x=172

x=172-15=157

b.76-x=19

x=76-19=57

c.x-47=5

x=47+5=52

d.120-(45+x)=12

45+x=120-12=108

x=108-45=63

 

Answer 2

e.5(x-25)=2³.3.5

  5(x-25)=120

x-25=120:5=24

x=24+25=49

g.68+(75-x)=93

  75-x=93-68=25

       x=75-25=50

Answer 3

Bài 2

a) 15 + x = 172

x = 172 - 15

x = 157

b) 76 - x = 19

x = 76 - 19

x = 57

c) x - 47 = 5

x = 5 + 47

x = 52

d) 120 - (45 + x) = 12

45 + x = 120 - 12

45 + x = 108

x = 108 - 45

x = 63

e) 5(x - 25) = 2³.3.5

5(x - 25) = 120

x - 25 = 120 : 5

x - 25 = 24

x = 24 + 25

x = 49

g) 68 + (75 - x) = 93

75 - x = 93 - 68

75 - x = 25

x = 75 - 25

x = 50

h) 175 - 5x = 25

5x = 175 - 25

5x = 150

x = 150 : 5

x = 30

i) 219 - 7(x + 1) = 100

7(x + 1) = 219 - 100

7(x + 1) = 119

x + 1 = 119 : 7

x + 1 = 17

x = 17 - 1

x = 16