Question

515 – 4x3 = 15

Answer 1

X đâu

Answer 2

\(\Leftrightarrow4x^3=500\)

hay x=5

Answer 3

\(\Rightarrow4x^3=515-15=500\\ \Rightarrow x^3=500:4=125=5^3\\ \Rightarrow x=5\)