\(5\left(x-2\right)\left(x-1\right)-\left(5x-4\right)\left(x-2\right)=0\)
<=>\(\left(5x-5\right)\left(x-2\right)-\left(5x-4\right)\left(x-2\right)=0\)
<=>\(\left(x-2\right)\left[\left(5x-5\right)-\left(5x-4\right)\right]=0\)
<=>\(\left(x-2\right)\left(5x-5-5x+4\right)=0\)
<=>\(\left(-1\right)\left(x-2\right)=0\)
<=>\(x-2=0\)
<=>\(x=2\)
Vậy phương trình có tập nghiệm là x=2
Bạn tham khảo:
5(x-2)(x-1)-(5x-4)(x-2)=0
<=>5(x2-3x+2)-(5x2-6x+8)=0
<=>5x2-15x+10-5x2+6x-8=0
<=>-9x+2=0
<=>-9x=-2
<=>x=2/9
\(5\left(x-2\right)\left(x-1\right)-\left(5x-4\right)\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(5x-5\right)-\left(5x-4\right)\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left[\left(5x-5\right)-\left(5x-4\right)\right]=0\)
\(\Leftrightarrow\left(x-2\right)\left(5x-5-5x+4\right)=0\)
\(\Leftrightarrow\left(x-2\right).\left(-1\right)=0\)\(\Leftrightarrow x-2=0\)\(\Leftrightarrow x=2\)
Vậy tập nghiệm của phương trình là \(S=\left\{2\right\}\)