\left. \begin{array} { l } { ( \frac { 1 } { a } + \frac { 1 } { b } + \frac { 1 } { c } ) a b c } \\ { ( \frac { a } { b } + \frac { b } { c } + \frac { c } { a } ) \cdot \frac { a b } { c } } \\ { ( a + x - x - y ) \cdot a ^ { 2 } } \end{array} \right.
Evaluate
c\left(a+b\right)+ab,\ \frac{ab^{2}+bc^{2}+ca^{2}}{c^{2}},\ \left(a-y\right)a^{2}
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