$1.$ Given an arithmetic expression $(20$pts$).$

$($a$)$ Please draw the arithmetic expression tree for the given expression. $(5$ pts$)$

$($b$)$ List the prefix expressions. $(5$ pts$)$

$($c$)$ List the infix expressions. $(5$ pts$)$

$($d$)$ List the postfix expressions. $(5$ pts$)$

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