Put a four operation symbol (addition sign, minus sign, multiplication sign or division sign, which can be selected repeatedly) in each □ in the formula 2 □ 3 □ 4 □ 5, and then only some parentheses (also may not be added), what is the largest two-digit number that can be obtained?
在算式2□3□4□5中的每一个□处放入一个四则运算符号(加号、减号、乘号或除号，可重复挑选)，然后仅允许在算式中添加一些括号(也可以不添加)，请问所能得到的最大的两位数是多少？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">2 * 7 * 5</gadget>
<output>70</output>

<result>70</result>