Toán Lớp 7: tìm x € Q biết : 2x . (x – 1/7)=0 giúp em với ạ em cảm ơn ????????????????????
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Toán Lớp 7: tìm x € Q biết : 2x . (x – 1/7)=0 giúp em với ạ em cảm ơn ????????????????????
Comments ( 2 )
2x . (x-1/7) = 0 \(\left[ \begin{array}{l}2x=0\\x-\frac{1}{7}=0 \end{array} \right.\)
\(\left[ \begin{array}{l}x=0:2\\x=0+\frac{1}{7}\end{array} \right.\)
\(\left[ \begin{array}{l}x=0\\x=\frac{1}{7}\end{array} \right.\)
2x . (x – 1/7)=0(x\inQQ)
<=>[(2x=0),(x-1/7=0):}
<=>[(x=0),(x=1/7):}
Vậy x=0;x=1/7 với x\inQQ