Calculate.

a) [[$ \displaystyle\frac {3x} {7} : \displaystyle\frac {9x} {14} $]]

b) [[$ \displaystyle\frac {x^5} {y^4} : \displaystyle\frac {3x^2} {2y^2} $]]

c) [[$ 3xyz : \displaystyle\frac {6xz} {y} $]]

d) [[$ \displaystyle\frac {4xyz} {5y^2} : \displaystyle\frac {3z^2} {10xy} $]]

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Solution