( 15/4 x 2/3 ) : 5 = ?
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a)\(x-15\%x=\frac{1}{3}\)
\(x.\left(1-15\%\right)=\frac{1}{3}\)
\(x.\frac{-280}{3}=\frac{1}{3}\)
\(x=\frac{1}{3}:\frac{-280}{3}\)
\(x=\frac{-1}{280}\)
Vậy \(x=\frac{-1}{280}\)
b)\(\frac{4}{5}x-x-\frac{3}{2}x+\frac{6}{5}=\frac{1}{2}-\frac{4}{3}\)
\(-\frac{17}{10}x+\frac{6}{5}=\frac{-5}{6}\)
\(-\frac{17}{10}x=-\frac{5}{6}-\frac{6}{5}\)
\(-\frac{17}{10}x=\frac{-61}{30}\)
\(x=\frac{-61}{30}:\frac{-17}{10}\)
\(x=\frac{61}{51}\)
Vậy \(x=\frac{61}{51}\)
21/5 + 3:|x/4-2/3|=6
=>3:|x/4-2/3|=6-21/5
=>|x/4-2/3|=3:9/5=5/3
ta có 2 th
TH1 x/4-2/3=5/3
=>x/4=2 =>x=8
TH2 x/4-2/3=-5/3
=>x/4=-1 =>x=-4
vậy x thuộc {-4;8}
nhớ cho mik
Bạn ơi, cho mk hỏi:
Tại sao lại từ x/4 - 2/3 = 5/3 lại suy ra x/4 = 2.
A) \(X+15=4^2\)
=> \(X=16-15\)
=> \(X=1\)
b) 100 : ( 35 - X ) = 5
=> 35 - X = 100 : 5
=> 35 - X = 20
=> X = 35 - 20
=> X = 15
C) \(3X-17=2^2\cdot2^4\)
=> \(3X-17=2^6=64\)
=> \(3X=64+17\)
=> \(3X=81\)
=> \(X=27\)
d) 120 - 20 ( 50 - 4X ) = 0
=> 20 ( 50 - 4X ) = 120
=> 50 - 4X = 120 : 20
=> 50 - 4X = 6
=> 4X = 50 - 6
=> 4X = 44
=> X = 11
\(\dfrac{1}{2022}\) \(\times\) \(\dfrac{2}{5}\) + \(\dfrac{1}{2022}\) \(\times\) \(\dfrac{7}{5}\) - \(\dfrac{1}{2022}\) \(\times\) \(\dfrac{8}{10}\)
= \(\dfrac{1}{2022}\) \(\times\) ( \(\dfrac{2}{5}\) + \(\dfrac{7}{5}\) - \(\dfrac{8}{10}\))
= \(\dfrac{1}{2022}\) \(\times\) ( \(\dfrac{9}{5}\) - \(\dfrac{4}{5}\))
= \(\dfrac{1}{2022}\) \(\times\) \(\dfrac{5}{5}\)
= \(\dfrac{1}{2022}\times1\)
= \(\dfrac{1}{2022}\)
\(3\sqrt{x}-2x=0\)
\(\Leftrightarrow3\sqrt{x}=2x\)
\(\Leftrightarrow\sqrt{x}=\frac{2x}{3}\)
\(\Leftrightarrow\left(\sqrt{x}\right)^2=\frac{4x^2}{9}\)
\(\Leftrightarrow x=\frac{4x^2}{9}\)
\(\Leftrightarrow\frac{4x^2}{x}=9\)
\(\Leftrightarrow4x=9\)
\(\Leftrightarrow x=\frac{9}{4}\)
\(3\sqrt{x}-2x=0\)
\(\Leftrightarrow9x-4x^2=0\)
\(\Leftrightarrow x\left(9-4x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\9-4x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=\frac{9}{4}\end{cases}}}\)
\((6-4\frac{1}{2}):0,03+(3\frac{1}{20}-2,65):4+\frac{2}{5}\)
\((6-4,5):0,03+(3,05-2,65):4+0,4\)
\(=1,5:0,03+0,4:4+0,4\)
\(=50+(0,4\cdot2):4\)
\(=50+0,2\)
\(=50,2\)
Chúc bạn học tốt
(15/4 x 2/3) : 5=\(\dfrac{5}{2}\):5=1/2
\(\left(\dfrac{15}{4}.\dfrac{2}{1}\right):5=\dfrac{15}{2}:5=\dfrac{15}{2}.\dfrac{1}{5}=\dfrac{3}{2}\)