In 25+25*25-25, how to add parentheses to get the largest number, and how to add parentheses to get the smallest number? Write down the formulas and calculate them.
在25+25*25-25中，怎样加括号所得的数最大，怎样加括号所得的数最小？分别写出算式并计算．
<gadget id="calculator">25 + 25</gadget>
<output>50</output>

<gadget id="calculator">25 - 25</gadget>
<output>0</output>

<gadget id="calculator">50 * 0</gadget>
<output>0</output>

<result>0</result>