• 2022-06-16
    甲乙丙三人向同一飞机射击,设击中的概率分别是[tex=4.786x1.214]C6eywDcMCHFWDBAhxQhEOA==[/tex].如果只有一人击中,则飞机被击落的概率是[tex=1.286x1.0]j0W2UqenmHM0zxWWacbYPA==[/tex];如果有二人击中,则飞机被击落的概率是[tex=1.286x1.0]plYB7DJ2i7s2mfU8hzgtHw==[/tex];如果三人都击中,则飞机一定被击落.求飞机被击落的概率.
  • 记[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]为事件“飞机被击落”,[tex=3.857x1.214]3TMqSL3ShOrUOCxOZTDd7EENyWpBeLru1VtNPAEqB1I=[/tex]分别为事件“甲击中飞机”,“乙击中飞机”,“丙击中飞机”,[tex=1.0x1.214]y4G9lbWa6HguBaLbpnFlXw==[/tex]为事件“有[tex=0.357x1.0]+eJLelx8thmbkEj/Y0iCOw==[/tex]人击中飞机”[tex=4.357x1.357]pZnWhxSSepTrknBX21BieA==[/tex],则[tex=8.714x1.214]6QelwANU2uTbwvL67eBDtym3AO6VN/mNCQzhRDung5Q=[/tex],[tex=13.429x1.357]D+UNzV/4xvgqxbQl8BE98XJwUeYybcRHkWpdPI7rDSPEmcc7iaCmzC8a/Te2BEU7f84EXyM9xtbvyYlRUavDfI+JKqJ/brVW7LP6tAoDyHuYiD5EcGaW6jUcLIgCtcB1moGfwDUUepl8ta/jknYDzA==[/tex],[tex=13.429x1.357]fEhWms9bzRDCreSKA82ob6riUDkj+xti/Bh1nt5zNEd3cs0ZldYqmuClWXjZd1JGAOkBg4gF2HSLsC2rZ9K+/l3vebagiWQ1V/65yAr2kok=[/tex],[tex=5.214x1.214]23FdvY8dUEwxN14hL2Q3aJteapZsEPlGB95o/dc2nHc=[/tex].由题意知[tex=15.643x1.357]fKF41nyD7pPtZ3Bgw1X4LBEDRRabjGzSSj931Ri+6/MB54Y/WMLBoZLvp1bM47bp5+HU8htxLejs1TN7OouRbW7gfM4PvCRFrlvm0zsTKeI=[/tex],[tex=19.643x1.357]okAuBIHukyeoXQuYpPFhZSIx4qCjdd6R1RlSzB8nEcPNN/i3oreuGRN1SyLEQZALjmTMH35K9dKyqrApLqWAoBqQbvSnlKtpW7hFs1xKtc/Gq54Mx5/2CpVinXOOaFEz[/tex].故[tex=16.143x1.5]5e0/G511hAvlqJ23LDTVxbDvv6ctm90Sse74EmCnUKYlEj4GNwkYn+MR9ZQcZ/0TRf58Ncj0LkH6jB65jhsrfedsLxsivJzkqOEm+35OurvOQ/nXqoz5GBfsC4yhD+EE[/tex].由于三人是否击中飞机相互独立,故[tex=24.786x7.643]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[/tex][tex=24.286x7.643]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[/tex][tex=12.857x4.357]a0s3MH7cLIdmiBRR0YN06w8kkugsw7lHssgn0wMHG6UOSSFBzw2YwJbECCFuXxoddeOnLIbEtO6Ahymb+MfxyopKq3vjGzmXsAKEIFhl45RWkTQo/I8g2dt0dfmtxuKGQ07l+amddzzCX05pZd2E8isqF7S9M1yhsbapK5d/3E6h5IU69LAG9Y6l6ghxmsGHM4t0xCi/jwz3RNQacjYlqfRhj/6Z4Yq20kMVTDf7/jiTZrZVohX2eS0xV6o1cFQO[/tex]因此飞机被击落的概率为[tex=20.143x4.357]a0s3MH7cLIdmiBRR0YN062Nwq/acg8Z8QHSoYP04sSuQL1skYBJNE1jP8/GqRTUiqrbz7gd1K1ak47ZuQ3v2Dwcy4j7lfNL6WrUjOvlNjD+XNFC4NHHf6RI9N4trhPH69hNKMGA6hsEgdxS8LxaIe/RMVjibmvk7c4pCDG4W2+xhB2Z7v1+CJsfYjHAUi7kdbjKPxsrvN+GlqcW87ksxMUjZ7MtnEaKe57Euq95qdSK5eIPB4svkSpy6kxkjesNp/Hcnt2glBtblRRCqCZJsoZPMWSUwY6Lzl7Ou/6NgU2OM7LcsUyfoX8LGhUe+hTvc6Bm7qxvMy1BLWEProl7v8g==[/tex]

    举一反三

    内容

    • 0

      甲、乙、丙座高射炮同向一飞机射击,设击中飞机的概率分别为0.5,0.6,0.7。如果只1座击中飞机,则飞机被击落的概率是0.2;如果有两座击中飞机,则飞机被击落的概率是0.2;如果三座全中,则飞机一定被击落,求飞机被击落的概率:

    • 1

      甲、乙、丙三人独立地向同一飞机进行射击,击中飞机的概率分别为04、0.5、0.7。如果一人击中飞机,飞机被击落的概率为0.2;两人击中飞机,飞机被击落的概率为0.6;三人击中飞机,飞机必被击落。飞机被击落的概率为( )

    • 2

      甲,乙,丙三人独立向同一飞机射击,设击中的概率分别为0.4,0.5,0.7;若只有一人击中,飞机被击落的概率为0.2,若两人击中,飞机被击落的概率为0.6,若三人击中,这飞机必定坠落,求飞机被击落的概率.

    • 3

      已知甲,乙,丙三人同时对飞机进行射击,三人击申飞机的概率分别为[tex=3.286x1.214]XMf2loegEmQq6eVWgLbDFw==[/tex][tex=1.571x1.0]rvvI+je/fE6H09NpP6OJdQ==[/tex] 又知飞机被一人击中面坠落的概率是[tex=1.571x1.0]aJjmUNhPobce3LJCroRdIQ==[/tex]飞机被二人击中而坠落的概率是[tex=1.571x1.0]A4d0dABEV/OF3g82y8OnIA==[/tex]飞机被三人击中必坠落.求飞机被击落的概率,

    • 4

      甲、乙、丙三人同时对飞机进行射击,三人击中的概率分别为0.4,0.5,0.7。飞机被一人击中而被击落的概率为0.2,被两人击中而被击落的概率为0.6,若三人都击中,飞机必定被击落。求飞机被击落的概率