\(2x^2+\left(-6\right)^3:27=0\)
\(2x^2+\left(-216\right):27=0\)
\(2x^2+\left(-8\right)=0\)
\(2x^2=8\)
\(x^2=4\)
\(\Rightarrow x=\pm2\)
=>2x^2-8=0
=>x^2=4
=>x=2 hoặc x=-2
2x2 + (-6)3 : 27 = 0
2x2 + -216 : 27 = 0
2x2 + -8 = 0
2x2 = 0-(-8)
2x2 = 8
x2 = 8:2
x2 = 4
x = 2 hoặc x = -2