Bài 6:
a: =>x=27:3/4=36
b: =>x=11/3x8/11=3/8
c: =>2/3x-1/2=5/6
=>2/3x=4/3
hay x=2
d: =>1/4x=3+1+2/3=4+2/3=14/3
=>x=56/3
Bài 7:
a:9/63=1/7
b: -63/81=-7/9
c: \(\dfrac{3\cdot\left(-5\right)}{27\cdot15}=\dfrac{-1}{27}\)
d: \(\dfrac{9\cdot5-9\cdot3}{18}=\dfrac{9\cdot2}{18}=1\)
e: \(=\dfrac{11\cdot\left(5-1\right)}{22}=\dfrac{11\cdot4}{22}=2\)
f: \(=\dfrac{15\left(6-4\right)}{15}=2\)
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