Question

Tìm X biết

1) 20. X - 3 = 0

2 ) ( X - 1) . ( X - 2 ) = 0

Answer 1

a, 20 . x - 3 = 0

=> x - 3 = 0 : 20

=> x - 3 = 0

=> x = 0 + 3

=> x = 3

b, ( x - 1 ) . ( x - 2 ) = 0

TH 1 : 

x-1 = 0

=> x = 0 + 1

=> x = 1

TH2 :

x - 2 = 0

=> x = 0 + 2 

=> x = 2

Vậy x = 1 hoặc x = 2

 

 

Answer 2

1)20.\(x-3=0\)

\(20.x=0+3\)

\(20.x=3\)

\(x=3:20\)

\(x=\frac{3}{20}\)

Vậy \(x=\frac{3}{20}\)

2)\(\left(x-1\right).\left(x-2\right)=0\)

\(\Rightarrow\)\(x-1=0\) hoặc \(x-2=0\)

TH1:\(x-1=0\)

\(x=0+1\)

\(x=1\)

TH2:\(x-2=0\)

\(x=0+2\)

\(x=2\)

Vậy \(x=1\) hoặc \(x=2\)