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Answer
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$\left( 4a ^{ 3 } b-5ab \right) \div ab-3a \left( 2a+b \right)$
$- 2 a ^ { 2 } - 3 a b - 5$
Arrange the rational expression
$\left ( \color{#FF6800}{ 4 } \color{#FF6800}{ a } ^ { \color{#FF6800}{ 3 } } \color{#FF6800}{ b } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ a } \color{#FF6800}{ b } \right ) \color{#FF6800}{ \div } \left ( \color{#FF6800}{ a } \color{#FF6800}{ b } \right ) - 3 a \left ( 2 a + b \right )$
$ $ Calculate the multiplication expression $ $
$\color{#FF6800}{ 4 } \color{#FF6800}{ a } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 5 } - 3 a \left ( 2 a + b \right )$
$4 a ^ { 2 } - 5 \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ a } \left ( \color{#FF6800}{ 2 } \color{#FF6800}{ a } \color{#FF6800}{ + } \color{#FF6800}{ b } \right )$
$ $ Expand the expression $ $
$4 a ^ { 2 } - 5 \color{#FF6800}{ - } \color{#FF6800}{ 6 } \color{#FF6800}{ a } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ a } \color{#FF6800}{ b }$
$\color{#FF6800}{ 4 } \color{#FF6800}{ a } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ - } \color{#FF6800}{ 6 } \color{#FF6800}{ a } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ a } \color{#FF6800}{ b }$
$ $ Organize the expression $ $
$\color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ a } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ a } \color{#FF6800}{ b } \color{#FF6800}{ - } \color{#FF6800}{ 5 }$
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