Question

Bài 1: Tìm x

( x - 1/3 ) . ( x + 2/5 ) = 0

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Answer 1

\(\left(x-\dfrac{1}{3}\right)\left(x+\dfrac{2}{5}\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x-\dfrac{1}{3}=0\\x+\dfrac{2}{5}=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=-\dfrac{2}{5}\end{matrix}\right.\)

Answer 2

`( x - 1/3 ) . ( x + 2/5 ) = 0`

`Th1`

`x-1/3=0`

`=>x=0+1/3`

`=>x=1/3`

`Th2`

`x+2/5=0`

`=>x=0-2/5`

`=>x=-2/5`

Answer 3

`( x - 1/3 ) . ( x + 2/5 ) = 0`

`->` \(\left[{}\begin{matrix}x-\dfrac{1}{3}=0\\x+\dfrac{2}{5}=0\end{matrix}\right.\)

`->` \(\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=-\dfrac{2}{5}\end{matrix}\right.\)

Answer 4

=> x-1/3=0 hoặc x+2/5=0*) x-1/3 = 0    X        = 2/3*) x+2/5= 0    X        = -2/5