\(\frac{4}{5}-\left|3-x\right|=\frac{1}{4}\)
\(\Rightarrow\left|3-x\right|=\frac{4}{5}-\frac{1}{4}\)
\(\Rightarrow\left|3-x\right|=\frac{11}{20}\)
\(\Rightarrow\hept{\begin{cases}3-x=\frac{11}{20}\\3-x=-\frac{11}{20}\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=\frac{49}{20}\\x=\frac{71}{20}\end{cases}}\)
\(\frac{8}{9}:x^2+\frac{1}{9}=1\)
\(\Rightarrow\frac{8}{9}:x^2+\frac{1}{9}=\frac{9}{9}\)
\(\Rightarrow\frac{8}{9}:x^2=\frac{9}{9}-\frac{1}{9}\)
\(\Rightarrow\frac{8}{9}:x^2=\frac{8}{9}\)
\(\Rightarrow x^2=\frac{8}{9}:\frac{8}{9}\)
\(\Rightarrow x^2=1\)
\(\Rightarrow x^2=1^2\)
\(\Rightarrow x=1\)
Thêm:
\(\frac{4}{5}+\frac{3}{4}.x\frac{5}{2}\)
\(x-\frac{1}{2}=-\frac{5}{2}\)
