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\(\dfrac{x-2}{5}=\dfrac{1-x}{6}\\ =>\left(x-2\right)\cdot6=\left(1-x\right)\cdot5\\ =>6x-12=5-5x\\ =>6x+5x=5+12\\ =>11x=17\\ x=\dfrac{17}{11}\)
e) \(\left(\dfrac{-1}{3}\right)\cdot\dfrac{5}{7}=\dfrac{\left(-1\right)\cdot5}{3\cdot7}=\dfrac{-5}{21}\)
f) \(\dfrac{2}{7}:\dfrac{3}{4}=\dfrac{2}{7}\cdot\dfrac{4}{3}=\dfrac{8}{21}\)
e) 1/3+1/3:x=1
1/3:x=1-1/3
1/3:x=2/3
x=1/3:2/3
x=1/2
f) x:3/4+1/4=-2/3
x:3/4=-2/3-1/4
x:3/4=-11/12
x=-11/12.3/4
x=-11/16
g) x:(1/2+1/3)=6/5
x:5/6=6/5
x=6/5.5/6
x=1
a) x + 7 = -12
x = (-12) - 7
x = 19
b) x - 15 = -21
x = (-21) + 15
x = -6
c) 13 - x = 20
x = 13 - 20
x = -7
\(\dfrac{x}{2}+\dfrac{3x}{5}-\dfrac{6}{5}=3\Leftrightarrow\dfrac{11x}{10}=3+\dfrac{6}{5}=\dfrac{21}{5}\)
\(\Rightarrow11x=42\Leftrightarrow x=\dfrac{42}{11}\)
\(\frac{1}{2}\)x + \(\frac{3}{5}\)( x - 2 ) = 3
\(\frac{1}{2}\)x + \(\frac{3}{5}\) x - \(\frac{3}{5}\). 2 = 3
x \((\)\(\frac{1}{2}\)+ \(\frac{3}{5}\) \()\)- \(\frac{6}{5}\) = 3
x . \(\frac{11}{10}\) - \(\frac{6}{5}\) = 3
x . \(\frac{11}{10}\) = 3 + \(\frac{6}{5}\) = \(\frac{21}{5}\)
x = \(\frac{21}{5}\) : \(\frac{11}{10}\) = \(\frac{42}{11}\)
NẾU CÓ GÌ SAI SÓT MONG BẠN THÔNG CẢM
a) ( 6x - 84) : 2 - 72 = 201
( 6x - 84) : 2=201+72
( 6x - 84) : 2=273
6x - 84=273x2
6x - 84=546
6x=546+84
6x=630
x=630:6
x=105
b) ( 3x - 34 ) . 63 = 65
3x - 34=65:63
3x - 34=62
3x-81=36
3x=36+81
3x=117
x=117:3
x=39
a) ( 6x - 84) : 2 - 72 = 201
=> (6x - 84) : 2 = 273
=> 6x - 84 = 546
=> 6x = 630
=> x = 105
b) ( 3x - 34 ) . 63 = 65
=> 3x - 34 = 65 : 63 = 62 = 36
=> 3x = 36 + 34 = 36 + 81 = 117
=> x = 39
\(3x+6=15\\ 3x=15-6\\ 3x=9\\ x=9:3\\ x=3\)