Question

a, 15 : x + 120 : 12 =15

b,[ ( x + 34 ) - 50].2 = 56

Answer 1

a, 15 : x + 120 : 12 =15

\(\Rightarrow\) 15 : x + 10 = 15

\(\Rightarrow\) 15 : x = 15 - 10

\(\Rightarrow\) 15 : x = 5

\(\Rightarrow\) x = 15 : 5

\(\Rightarrow\) x = 3

b, [ ( x + 34 ) - 50].2 = 56

\([\left(x+34\right)-50]=56:2\)

(x + 34 ) - 50 = 28

x + 34 = 28+50

x+34 =78

x = 78 - 34

x = 44

Answer 2

a,15:x+120 : 12 = 15

15 : x + 10 = 15

15: x = 15 -10

15 : x = 5

x = 15 : 5

x = 3

vậy x = 3