1.
\(x=\dfrac{3}{17}\Rightarrow\left|x\right|=\left|\dfrac{3}{17}\right|=\dfrac{3}{17}\)
\(x=-\dfrac{13}{161}\Rightarrow\left|x\right|=\left|-\dfrac{13}{161}\right|=\dfrac{13}{161}\)
\(x=-15,08\Rightarrow\left|x\right|=\left|-15,08\right|=15,08\)
2.(Bài này mình lấy máy tính bấm luôn á! Nếu GV yêu cầu bạn quy đồng thì bạn tự quy đồng nha!
)
\(\dfrac{-6}{25}+\left|-\dfrac{4}{5}\right|-\dfrac{2}{25}\\ =\dfrac{-6}{25}+\dfrac{4}{5}-\dfrac{2}{25}\\ =\dfrac{12}{25}\)
\(\dfrac{5}{9}-\left|-\dfrac{3}{5}\right|+\dfrac{4}{9}+\dfrac{8}{5}\\ =\dfrac{5}{9}-\dfrac{3}{5}+\dfrac{4}{9}+\dfrac{8}{5}\\ =\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\left(-\dfrac{3}{5}+\dfrac{8}{5}\right)\\ =1+1\\ =2\)
Chúc bạn học giỏi!
