Question

a, 223 - 6 . ( x + 5 ) =49

b, 4x³ + 12 =120

giúp mình với ạ 

cảm ơn <3

Answer 1

\(a,223-6\left(x+5\right)=49\\ 6\left(x+5\right)=223-49\\ 6\left(x+5\right)=174\\ x+5=174:6\\ x+5=29\\ x=29-5\\ x=24\\ ----\\ b,4x^3+12=120\\ 4x^3=120-12\\ 4x^3=108\\ x^3=108:4\\ x^3=27\\ Mà:3^3=27\\ Nên:x^3=3^3\\ Vậy:x=3\)

Answer 2

a. 223 - 6. (x + 5) = 49

6. (x + 5) = 223 - 49

6. (x + 5) = 174

x + 5 = 174 : 6

x + 5 = 29

x = 29 - 5

x = 24

 

Answer 3

b. 4x³ + 12 = 120

4x³ = 120 - 12 = 108

x³ = 108 : 4 = 27

x³ = 3³

x= 3