Tìm x ∈ Q, biết rằng: 11 12 - 2 5 + x = 2 3
Tìm x € Q , biết rằng
a) 11/12 - (2/5 + x) = 2/3
b) 3/4+ 1/4 : x = 2/3
tìm x \(\in\) Q biết rằng
\(\dfrac{11}{12}\) - ( \(\dfrac{2}{5}\) + x ) = \(\dfrac{2}{3}\)
2x \(\times\) ( x - \(\dfrac{1}{7}\) ) = 0
\(\dfrac{3}{4}\) + \(\dfrac{1}{4}\) : x = \(\dfrac{2}{5}\)
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) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
\(\Leftrightarrow\dfrac{1}{4x}=\dfrac{2}{5}-\dfrac{3}{4}\)
\(\Leftrightarrow\dfrac{1}{4x}=-\dfrac{7}{20}\)
\(\Leftrightarrow4x=-\dfrac{20}{7}\)
\(\Leftrightarrow x=-\dfrac{5}{7}\)
tìm x e Q , biết rằng:\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)
làm nhanh có tick
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
tìm x thuộc Q biết rằng :
a) 11/12 - ( 2/5 + x ) = 2/3
b) 2x ( x - 1/7) =0
c) 3/4 + 1/4 :x =2/5
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Tìm x thuộc Q biết rằng
a, 11/12-(2/5+x) = 2/3
b, 2x.(x-1/7)=0
c,3/4+1/4:x=2/5
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)\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)
<=>\(\frac{1}{4}:x=\frac{2}{5}-\frac{3}{4}\)
<=>\(\frac{1}{4}:x=-\frac{7}{20}\)
<=>\(x=\frac{1}{4}:\left(-\frac{7}{20}\right)\)
<=>\(x=-\frac{5}{7}\)
Tìm x thuộc Q biết rằng:
a) 11/12 - (2/5 + x) = 2/3
b) 2.x (x - 1/7) = 0
c) 3/4 + 1/4 : x = 2/5
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
3/4+1/4:x=2/5
=>1/4:x=2/5-3/4
=>1/4:x=-7/20
=>x=1/4:-7/20
=>x=-5/7
tìm \(x\in Q\) ,biết rằng
\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)
11/12 - (2/5 + x) = 2/3
11/12 - 2/5 - x = 2/3
-x = 2/3 - 11/12 + 2/5
-x = 40/60 - 55/60 + 24/60
-x = 9/60
-x = 3/20
x = - 3/20
1. tìm x thuộc Q, biết rằng
a)11/12 - (2/5+x) = 2/3 b) 3/4+1/4:x= 2/3
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
Tìm x ϵ Q, biết rằng:
a) 11/12- (2/5+x)=2/3
b) 3/4+1/4:x=2/3
giúp mk nhé thanks trc ! mai mk phải nộp bài r
a)\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)
\(\frac{2}{5}+x=\frac{1}{4}\)
\(x=\frac{1}{4}-\frac{2}{5}\)
\(x=-\frac{3}{20}\)
Vậy \(x=-\frac{3}{20}\)
b)\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{3}\)
\(\frac{1}{4}:x=-\frac{1}{12}\)
\(x=\frac{1}{4}:\left(-\frac{1}{12}\right)\)
\(x=-3\)
Vậy \(x=-3\)
Tìm \(x\in Q\), biết rằng :
a) \(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
b) \(2x\left(x-\dfrac{1}{7}\right)=0\)
c) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
a)\(\dfrac{11}{12}-\left(\dfrac{2}{5}+x\right)=\dfrac{2}{3}\)
\(\dfrac{2}{5}+x=\dfrac{11}{12}-\dfrac{2}{3}\)
\(\dfrac{2}{5}+x=\dfrac{11}{12}-\dfrac{8}{12}\)
\(\dfrac{2}{5}+x=\dfrac{3}{12}\)
\(\dfrac{2}{5}+x=\dfrac{1}{4}\)
\(x=\dfrac{1}{4}-\dfrac{2}{5}\)
\(x=\dfrac{5}{20}-\dfrac{8}{20}\)
\(x=\dfrac{-3}{20}\)
b)\(2x\left(x-\dfrac{1}{7}\right)=0\)
\(\Rightarrow2x=0\) hoặc \(x-\dfrac{1}{7}=0\)
\(x=0:2\) \(x=0+\dfrac{1}{7}\)
\(x=0\) \(x=\dfrac{1}{7}\)
\(\Rightarrow x=0\) hoặc \(x=\dfrac{1}{7}\)
c)\(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
\(\dfrac{1}{4}:x=\dfrac{2}{5}-\dfrac{3}{4}\)
\(\dfrac{1}{4}:x=\dfrac{8}{20}-\dfrac{15}{20}\)
\(\dfrac{1}{4}:x=\dfrac{-7}{20}\)
\(x=\dfrac{1}{4}:\dfrac{-7}{20}\)
\(x=\dfrac{1}{4}.\dfrac{-20}{7}\)
x= \(\dfrac{1.\left(-5\right)}{1.7}\)
\(x=\dfrac{-5}{7}\)