Toán Lớp 7: /x-1/+x=3
giúp mk nha mn
mk cảm ơn
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Toán Lớp 7: /x-1/+x=3
giúp mk nha mn
mk cảm ơn
Comments ( 2 )
<=>|x-1|=3-x (Đk : x>=1)
<=>\(\left[ \begin{array}{l}x-1=3-x\\x-1=x-3\end{array} \right.\)
<=>\(\left[ \begin{array}{l}x+x=3+1\\x-x=-3+1\end{array} \right.\)
<=>\(\left[ \begin{array}{l}2x=4\\0=-2 (L)\end{array} \right.\)
<=>2x=4
<=>x=2 (Tmđk)
Vậy : x=2