If the probability of a certain anti-aircraft missile hitting the enemy plane is (1/2), what is the probability that at least one of the two same anti-aircraft missiles will hit the enemy plane at the same time?
如果一枚某种防空导弹击中敌机的可能性是(1/2)，那么二枚同样的防空导弹同时发射，至少一枚击中敌机的可能性为多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>