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a) \(x+\dfrac{1}{2}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}-\dfrac{1}{2}\)
\(x=\dfrac{6}{10}-\dfrac{5}{10}\)
\(x=\dfrac{1}{10}\)
b) \(x\times\dfrac{6}{7}=\dfrac{5}{21}\)
\(x=\dfrac{5}{21}:\dfrac{6}{7}\)
\(x=\dfrac{5}{21}\times\dfrac{7}{6}\)
\(x=\dfrac{5}{18}\)
c) \(x:\dfrac{4}{3}=\dfrac{8}{9}\)
\(x=\dfrac{8}{9}\times\dfrac{4}{3}\)
\(x=\dfrac{32}{27}\)
a: x=3/5-1/2=6/10-5/10=1/10
b: x=5/21:6/7=5/21x7/5=35/105=1/3
c: x=8/9x4/3=32/27
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a)4/9 : x/6 = 2/3
x/6 = 4/9 : 2/3
x/6 = 2/3 = 4/6
vậy x = 4
b)x/5 x 3/7 = 9/35
x/5 = 9/35 : 3/7
x/5 = 3/5
vậy x = 3
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X + 5/9 = 4/3
X = 4/3 - 5/9
X = 7/9
X - 4/9 = 1/2
X = 1/2 + 4/9
X = 17/18
6/13 + X = 7/6
X = 7/6 - 6/13
X = 55/78
13/5 - X = 5/6
X = 13/5 - 5/6
X= 53/30
X + 5/9 = 4/3
x = 4/3 - 5/9
x = 7/9
X - 4/9 = 1/2
x = 1/2 + 4/9
x = 17/18
6/13 + X = 7/6
x = 7/6 - 6/13
x - 55/78
13/5 - X = 5/6
x = 13/5 - 5/6
x = 53/30
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\(1.x-\dfrac{2}{3}\times\left(x+9\right)=1\)
\(x-\dfrac{2}{3}\times x-6=1\)
\(x\times\left(1-\dfrac{2}{3}\right)=7\)
\(x\times\dfrac{1}{3}=7\)
\(x=21\)
\(2.x-\dfrac{11}{15}=\dfrac{3+x}{5}\)
\(\dfrac{15x}{15}-\dfrac{11}{15}=\dfrac{9+3x}{15}\)
\(15x-11=9+3x\)
\(12x=20\)
\(x=\dfrac{5}{3}\)
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