4,5 -(5/9)
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(\(x\) + \(\dfrac{3}{5}\))2 + \(\dfrac{41}{25}\) = 9%: 4,5%
(\(x\) + \(\dfrac{3}{5}\))2 + \(\dfrac{41}{25}\) = 2
(\(x\) + \(\dfrac{3}{5}\))2 = 2 - \(\dfrac{41}{25}\)
(\(x\) + \(\dfrac{3}{5}\))2 = \(\dfrac{9}{25}\)
\(\left[{}\begin{matrix}x+\dfrac{3}{5}=\dfrac{3}{5}\\x+\dfrac{3}{5}=-\dfrac{3}{5}\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=\dfrac{3}{5}-\dfrac{3}{5}\\x=-\dfrac{3}{5}-\dfrac{3}{5}\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=0\\x=-\dfrac{6}{5}\end{matrix}\right.\)
Vậy \(x\in\) {-1; \(\dfrac{1}{5}\)}
\(\Leftrightarrow\left(x+\dfrac{3}{5}\right)^2+\dfrac{21}{5}=\dfrac{10}{5}\)
\(\Leftrightarrow\left(x+\dfrac{3}{5}\right)^2=-\dfrac{11}{5}\)(vô lý)
a: \(-\dfrac{1}{21}-\dfrac{1}{14}=\dfrac{-14-21}{294}=\dfrac{-35}{294}=-\dfrac{5}{42}\)
b: \(\dfrac{-1}{9}-\dfrac{5}{12}=\dfrac{-12-45}{108}=\dfrac{-57}{108}=\dfrac{-19}{36}\)
c: \(\dfrac{-14}{20}+\dfrac{3}{5}=\dfrac{-7}{10}+\dfrac{6}{10}=\dfrac{-1}{10}\)
`a)-4/9(5/6*90%-8:0,32)`
`=-4/9(5/6*9/10-8:8/25)`
`=-4/9(3/4-25)`
`=-4/9*(-97)/4=97/9`
`b)(2/5)^2+5 1/2.(4,5-2)+(2^3)/(-4)`
`=4/25+11/2*5/2+8/(-4)`
`=4/25+55/4-2`
`=1191/100`
\(=\dfrac{9}{2}-\dfrac{5}{9}=\dfrac{71}{18}\)
\(4,5-\dfrac{5}{9}=\dfrac{40,5}{9}-\dfrac{5}{9}=\dfrac{40,5-5}{9}=\dfrac{35,5}{9}\)