Evaluate the following postfix expression: $56+7*89*-$

Convert the following Infix to a Postfix expression:

$($A $+$ B$)*$C$-$D$*$E

$(($ A $+$ B $)*$ D $)($ E $-$ F$)$

Convert the following Infix to Postfix expressions and evaluate it:

$3+(4*5(6/78)*9)*10$

$23+5*2212/6$