设<img src="https://zk.995w.com/lqwvjeImg/40/408bfb7643639711a78b10a0ea53062f.png" style="width:19px;height:17px;">与<img src="https://zk.995w.com/lqwvjeImg/8f/8f7da4657ed0506b821ba5079b47c67f.png" style="width:15px;height:17px;">为相互独立的随机变量,其分布函数分别为<img src="https://zk.995w.com/lqwvjeImg/fb/fb77f7248f364b65f2efe4235a9359fc.png" style="width:43px;height:24px;">和<img src="https://zk.995w.com/lqwvjeImg/ef/ef54efe0fac871378386a25ae9720f5e.png" style="width:43px;height:24px;">,则随机变量<img src="https://zk.995w.com/lqwvjeImg/27/27f446a3e3c3beab64c1ca04fe141581.png" style="width:97px;height:21px;">的分布函数为( ).<br>·<img src="https://zk.995w.com/lqwvjeImg/dd/dd44af4d5ce5c2bd2b6337ab3ea419b3.png" <br>·<img src="https://zk.995w.com/lqwvjeImg/c0/c0d1ffd1d805375a47b69dd5358dc4ca.png" <br>·<img src="https://zk.995w.com/lqwvjeImg/41/413c2bfd530be7f0d1a9e2cb1d5d64eb.png" <br>·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15510862207379965611916cd4d2b998b6afa36c278e7image64.png"