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a) ( 2x - 3 ) - ( x - 5 ) = ( x + 7 ) - ( x + 2 )
<=> 2x - 3 - x + 5 = x + 7 - x - 2
<=> x = 3
b)(7x-5)-(6x+4)=(2x+3)-(2x+1)
<=> 7x - 5 - 6x - 4 = 2x + 3 - 2x - 1
<=> x = 11
c)(9x-3)-(8x+5)=(3x+2)
<=> 9x - 3 - 8x - 5 = 3x + 2
<=> -2x = 10
<=> x = -5
d)(x+7)-(2x+3)=(3x+5)-(2x+4)
<=> x + 7 - 2x - 3 = 3x + 5 - 2x - 4
<=> -2x = -3
<=> x = 3/2
ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠᅠ ᅠ
a. \(\frac{1}{3}x-\frac{2}{5}=\frac{2}{3}x+1\)
\(\Leftrightarrow\frac{1}{3}x-\frac{2}{3}x=1+\frac{2}{5}\)
\(\Leftrightarrow-\frac{1}{3}x=\frac{7}{5}\)
\(\Leftrightarrow x=\frac{7}{5}\div\frac{-1}{3}\)
\(\Leftrightarrow x=\frac{21}{-5}\)
b. \(\frac{-4}{5}x+\frac{1}{3}=\frac{2}{3}x+\frac{1}{2}\)
\(\Leftrightarrow\frac{1}{3}-\frac{1}{2}=\frac{2}{3}x+\frac{4}{5}x\)
\(\Leftrightarrow\frac{-1}{6}=\frac{22}{15}x\)
\(\Leftrightarrow x=\frac{-1}{6}\div\frac{22}{15}\)
\(\Leftrightarrow x=\frac{-15}{132}\)
b, \(\frac{1}{6}x+\frac{1}{10}x-\frac{4}{15}x+1=0\)
\(x\left(\frac{1}{6}+\frac{1}{10}-\frac{4}{15}\right)+1=0\)
\(x.0=-1\)
\(\Rightarrow x\in rỗng\)
a) 2/3x-1/2x=15/12
=> x.(2/3-1/2)=15/12
=> x.1/6 =15/12
=> x =15/12:1/6
=> x =5/24
b) 7x-3x=3,2
=> x.(7-3) =3,2
=> x.4 =3,2
=> x =3,2:4
=> x =0,8
a,2/3.x - 1/2 . x = 5/12
x . ( 2/3 - 1/2 ) = 5/12
x . 1/6 = 5/12
x = 5/12 : 1/6
x = 15/1
a) \(55-4x-4\left(-x+3\right)=6-2\left(-8-3x\right)\)
\(55-4x+4x-12=6+16+6x\)
\(43-6-16=6x\)
\(6x=21\)
\(x=3,5\)
b) \(-5\left(-2x-6\right)-9\left(4-7x\right)=51-3x+6\left(x-9\right)\)
\(10x+30-36+63x=51-3x+6x-54\)
\(73x-6=-3+3x\)
\(73x-3x=-3+6\)
\(70x=3\)
\(x=\frac{3}{70}\)
c) \(93+\left|6-3x\right|-39=231\)
\(\left|6-3x\right|+54=231\)
\(\left|6-3x\right|=177\)
\(\Rightarrow\orbr{\begin{cases}6-3x=177\\6-3x=-177\end{cases}}\Rightarrow\orbr{\begin{cases}3x=6-177\\3x=6+177\end{cases}}\Rightarrow\orbr{\begin{cases}3x=-171\\3x=183\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-57\\x=61\end{cases}}\)
\(-\frac{3}{7}x\)\(=3\)\(\Rightarrow x=3:-\frac{3}{7}\)\(\Rightarrow x=-7\)
\(\frac{2x}{3}\)\(-\frac{1}{5}\)\(=\frac{2}{5}\)\(\Rightarrow\frac{2x}{3}\)\(=\frac{2}{5}\)\(+\frac{1}{5}\)\(\Rightarrow\frac{2x}{3}\)\(=\frac{3}{5}\)\(\Rightarrow x=\frac{3}{5}\)\(:\frac{2}{3}\)\(\Rightarrow x=\frac{9}{10}\)
Chúc bạn học tốt!
a) \(\frac{-3}{7x}=3\)
\(\Rightarrow\frac{-3}{7x}=\frac{3}{1}\)
=> -3 = 3 . 7x
=> -3 = 21x
=> x = -3/21 = -1/7
b) \(\frac{\frac{2}{3x-1}}{5}=\frac{2}{5}\)
\(\Rightarrow\frac{2}{3x-1}=\frac{2}{1}\)
=> 2 = ( 3x - 1 ) . 2
=> 3x - 1 = 2 : 2 = 1
=> 3x = 1 + 1 = 2
=> x = 2/3