a) \(x+\dfrac{4}{5}=\dfrac{45}{5}-\left(\dfrac{3}{7}+\dfrac{3}{5}\right)\)
\(x+\dfrac{4}{5}=\dfrac{45}{5}-\dfrac{36}{35}\)
\(x+\dfrac{4}{5}=\dfrac{279}{35}\)
\(x=\dfrac{279}{35}-\dfrac{4}{5}\)
\(x=\dfrac{251}{35}\)
b) \(\dfrac{5}{8}\times x=\dfrac{4}{5}\)
\(x=\dfrac{4}{5}\div\dfrac{5}{8}\)
\(x=\dfrac{32}{25}\)
a) x + 4/5 = 45/5 - (3/7 + 3/5)
x + 4/5 = 45/5 - 36/35
x + 4/5 = 279/35
x = 279/35 - 4/5
x = 251/35
vậy x =...
b) 5/8 x X = 4/5
X = 5/8 : 4/5
X = 32/25
vậy x =...