a) \(x\left(x-1\right)=0\)
\(\Rightarrow x=0\) hoặc \(x-1=0\)
+) \(x=0\)
+) \(x-1=0\Rightarrow x=1\)
Vậy \(x\in\left\{0;1\right\}\)
b) \(\left(x+2\right)\left(x-4\right)=0\)
\(\Rightarrow x+2=0\) hoặc \(x-4=0\)
+) \(x+2=0\Rightarrow x=-2\)
+) \(x-4=0\Rightarrow x=4\)
Vậy \(x\in\left\{-2;4\right\}\)
c) \(x^3.x^2=2^8:2^3\)
\(\Rightarrow x^5=2^5\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
d) \(3^{x-3}-3^2=2.3^2\)
\(\Rightarrow3^{x-3}=18+9\)
\(\Rightarrow3^{x-3}=27\)
\(\Rightarrow3^{x-3}=3^3\)
\(\Rightarrow x-3=3\)
\(\Rightarrow x=6\)
Vậy \(x=6\)
a) x(x-1)=0
=> x.x =0+1
=> x.x =1
=> x^2 =1
=> x^2 =1^2
=> x =1
