<span style="font-family: 宋体,simsun">某单位同时装有两种报警系统A与B,当报警系统A单独使用时,其有效的概率为0.70,当报警系统B单独使用时,其有效的概率为0.80,在报警系统A有效的条件下,报警系统B有效的概率为0.84. 若发生意外时,求:</span>

<span style="widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; display: inline !important; font: 16px/28px zuoyefont_mathfont, &39;microsoft yahei&39;, 宋体, sans-serif; white-space: normal; float: none; letter-spacing: normal; color: rgb(51,51,51); word-spacing: 0px; -webkit-text-stroke-width: 0px"><span style="widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; display: inline !important; font: 16px/28px 宋体,simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(51,51,51); word-spacing: 0px; -webkit-text-stroke-width: 0px">(1)</span><span style="widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; display: inline !important; font: 16px/28px 宋体,simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(51,51,51); word-spacing: 0px; -webkit-text-stroke-width: 0px">两种报警系统都有效的概率</span></span> <span style="widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; display: inline !important; font: 16px/28px 宋体,simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(51,51,51); word-spacing: 0px; -webkit-text-stroke-width: 0px">(2)在报警系统B有效地条件下,报警系统A有效的概率</span> <span style="widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; display: inline !important; font: 16px/28px 宋体,simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(51,51,51); word-spacing: 0px; -webkit-text-stroke-width: 0px">(3)两种报警系统中至少有一种系统有效的概率</span> <span style="widows: 1; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; display: inline !important; font: 16px/28px 宋体,simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(51,51,51); word-spacing: 0px; -webkit-text-stroke-width: 0px">(4)两种报警系统都是零的概率</span>

时间:2023-03-26 12:39:37

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