The number key "7" on the calculator is broken. If you use this calculator to calculate "963-397", what is the incorrect calculation method below?
计算器上的数字键"7"坏了，如果用这个计算器计算"963-397"，下面计算方法不正确的是多少
<gadget id="calculator">964 - 396</gadget>
<output>568</output>

<result>568</result>