Toán Lớp 7: Tìm x biết :
$\frac{1}{7}$ <|x-$\frac{4}{7}$|< $\frac{3}{7}$
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Toán Lớp 7: Tìm x biết :
$\frac{1}{7}$ <|x-$\frac{4}{7}$|< $\frac{3}{7}$
Comments ( 1 )
⇒$\left \{ {{\dfrac{1}{7}<x<\dfrac{3}{7}+\dfrac{4}{7}} \atop {\dfrac{1}{7}<x<\dfrac{4}{7}-\dfrac{3}{7}}} \right.$
⇒$\left \{ {{\dfrac{1}{7}<x<\dfrac{7}{7}} \atop {\dfrac{1}{7}<x<\dfrac{1}{7}}} \right.$ ⇒$\left \{ {{1<x<7} \atop {1<x<1}} \right.$ ⇒$\left \{ {{x∈{2; 3; 4; 5; 6}} \atop {loại .do .vô .lý}} \right.$