(3^1^2-3^5):(3^10-3^3) help me now
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\(|\frac{2x-1}{3}|+\frac{2}{5}=0.75\)
\(\Rightarrow|\frac{2x-1}{3}|=\frac{7}{4}-\frac{2}{5}=\frac{27}{20}\)
\(\Rightarrow\hept{\begin{cases}\frac{2x-1}{3}=\frac{27}{20}\\\frac{2x-1}{3}=-\frac{27}{20}\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}2x-1=\frac{81}{20}\\2x-1=-\frac{81}{20}\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=\frac{101}{40}\\x=-\frac{61}{40}\end{cases}}\)
P/s : Không chắc :))
\(\left|2x-\frac{1}{3}\right|+\frac{2}{5}=0.75\)
\(\left|2x-\frac{1}{3}\right|+\frac{2}{5}=\frac{3}{4}\)
\(\Rightarrow\left|2x-\frac{1}{3}\right|=\frac{7}{20}\)
\(\Rightarrow\orbr{\begin{cases}2x-\frac{1}{3}=\frac{7}{20}\\2x-\frac{1}{3}=-\frac{7}{20}\end{cases}}\Rightarrow\orbr{\begin{cases}2x=\frac{41}{60}\\2x=-\frac{1}{60}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{41}{120}\\x=-\frac{1}{120}\end{cases}}\)(Đến đoạn này bạn tính lại hộ mình nhé.mik hay tính sai:3)
\(\dfrac{1}{5}\times x-\dfrac{2}{3}=\dfrac{1}{10}\times x+\dfrac{5}{6}\)
\(\dfrac{1}{5}x-\dfrac{2}{3}-\dfrac{1}{10}x-\dfrac{5}{6}=0\)
\(\dfrac{1}{5}x-\dfrac{1}{10}x-\dfrac{2}{3}-\dfrac{5}{6}=0\)
\(\dfrac{1}{10}x-\dfrac{3}{2}=0\)
\(\dfrac{1}{10}x=\dfrac{3}{2}\)
\(x=15\)
\(\dfrac{1}{5}\).x - \(\dfrac{2}{3}\) = \(\dfrac{1}{10}\).x + \(\dfrac{5}{6}\)
⇒ \(\dfrac{1}{5}\).x - \(\dfrac{1}{10}\).x = \(\dfrac{5}{6}\) + \(\dfrac{2}{3}\)
⇒ \(\dfrac{2}{10}\).x - \(\dfrac{1}{10}\).x = \(\dfrac{5}{6}\) + \(\dfrac{4}{6}\)
⇒ \(\dfrac{1}{10}\).x = \(\dfrac{9}{6}\)
⇒ x = \(\dfrac{9}{6}\) : \(\dfrac{1}{10}\)
⇒ x = \(\dfrac{9}{6}\) . 10
⇒ x = \(\dfrac{90}{6}\)
⇒ x = 15
Vậy x = 15
\(-\dfrac{4}{7}-x=\dfrac{3}{5}-2x\\ \Rightarrow-x+2x=\dfrac{3}{5}+\dfrac{4}{7}\\ \Rightarrow x=\dfrac{21}{35}+\dfrac{20}{35}\\ \Rightarrow x=\dfrac{41}{35}\)
Vậy `x=41/35`
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\(\dfrac{3}{7}x-\dfrac{2}{3}x=\dfrac{10}{21}\\ \Rightarrow\left(\dfrac{3}{7}-\dfrac{2}{3}\right)x=\dfrac{10}{21}\\ \Rightarrow\left(\dfrac{9}{21}-\dfrac{14}{21}\right)x=\dfrac{10}{21}\\ \Rightarrow\dfrac{-5}{21}x=\dfrac{10}{21}\\ \Rightarrow x=\dfrac{10}{21}:\left(-\dfrac{5}{21}\right)\\ \Rightarrow x=-2\)
Vậy `x=-2`
a)
-4/7 - x = 3/5 - 2x
2x - x = 3/5 + 4/7
x = 41/35
Vậy x = 41/35
b)
3/7.x - 2/3.x = 10/21
x(3/7 - 2/3) = 10/21
x.(-5/21) = 10/21
x = 10/21 : (-5/21) = -2
Vậy x = -2
Nguyễn Trà My
Phần a)
\(3\times\left(\frac{1}{2}-x\right)+\frac{1}{3}=\frac{7}{6}-x\)
\(32-3x+13=76-x\)
\(116-3x=76-x\)
\(116-76=3x-x\)
\(46=2x\)
\(x=46\div2\)
\(x=13\)