1. tìm x thuộc Q, biết rằng
a)11/12 - (2/5+x) = 2/3 b) 3/4+1/4:x= 2/3
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a) 11/12-(2/5+x)=2/3
=>2/5+x=11/12-2/3
=>2/5+x=1/4
=>x=1/4-2/5
=>x=-3/20
b) 2.x(x-1,7)=0
=>x(x-1,7)=0
=>x= 0 hoặc x-1,7=0
=>x=0 hoặc x= 1,7
a)\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)
<=>\(\frac{11}{12}-\frac{2}{5}-x=\frac{2}{3}\)
<=>\(-x=\frac{2}{3}-\frac{11}{12}+\frac{2}{5}\)
<=>\(-x=\frac{3}{20}\)
<=>\(x=-\frac{3}{20}\)
b)\(2x\left(x-\frac{1}{7}\right)=0\)
<=>2x=0 hoặc \(x-\frac{1}{7}=0\)
<=>x=0 hoặc x=\(\frac{1}{7}\)
c)\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)
<=>\(\frac{1}{4}:x=\frac{2}{5}-\frac{3}{4}\)
<=>\(\frac{1}{4}:x=-\frac{7}{20}\)
<=>\(x=\frac{1}{4}:\left(-\frac{7}{20}\right)\)
<=>\(x=-\frac{5}{7}\)
1. 2/5 + x= 11/12 - 2/5
=> x= 31/60 - 2/5
=> x= 7/60
Vậy x= 7/60
2. 2x(x - 1/7)= 0
TH1: x=0
TH2: x= 0 + 1/7 = 1/7
Vậy x= 0 hoặc 1/7
3. 1/4 : x= 2/5 - 3/4
=> x= 1/4 : (-7/20)
=> x= -5/7
Vậy x= -5/7
Bài 1:
a: \(x=\dfrac{2}{3}:\dfrac{3}{5}=\dfrac{2}{3}\cdot\dfrac{5}{3}=\dfrac{10}{9}\)
b: \(x=\dfrac{17}{8}:\dfrac{7}{17}=\dfrac{17}{8}\cdot\dfrac{17}{7}=\dfrac{289}{56}\)
c: \(x=-\dfrac{3}{4}:\dfrac{7}{12}=\dfrac{-3}{4}\cdot\dfrac{12}{7}=\dfrac{-63}{28}=-\dfrac{9}{4}\)
d: \(\Leftrightarrow x\cdot\dfrac{1}{6}=\dfrac{3}{8}-\dfrac{1}{4}=\dfrac{1}{4}\)
hay \(x=\dfrac{1}{4}:\dfrac{1}{6}=\dfrac{3}{2}\)
e: \(\Leftrightarrow\dfrac{1}{2}:x=-4-\dfrac{1}{3}=-\dfrac{17}{3}\)
hay \(x=-\dfrac{1}{2}:\dfrac{17}{3}=\dfrac{-3}{34}\)
1) \(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{11}{12}-\dfrac{2}{5}-x=\dfrac{2}{3}\)
\(\Leftrightarrow x=\dfrac{11}{12}-\dfrac{2}{5}-\dfrac{2}{3}\)
\(\Leftrightarrow x=-\dfrac{3}{20}\)
2) \(2x\left(x-\dfrac{1}{7}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}2x=0\\x-\dfrac{1}{7}=0\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{1}{7}\end{matrix}\right.\)
3) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
\(\Leftrightarrow\dfrac{1}{4x}=\dfrac{2}{5}-\dfrac{3}{4}\)
\(\Leftrightarrow\dfrac{1}{4x}=-\dfrac{7}{20}\)
\(\Leftrightarrow4x=-\dfrac{20}{7}\)
\(\Leftrightarrow x=-\dfrac{5}{7}\)
1.Tìm x thuộc Q
a. 11/12 - ( 2/5 + x ) = 2/3
2/5 + x = 11/12 - 2/3
2/5 + x = 1/4
x = -3/20
b. 3/4 + 1/4 : x = 2/3
1/4 : x = 2/3 - 3/4
1/4 : x = -1/12
x = 1/4 : -1/12
x = -3