举一反三
- 设[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]为给定实数,试用不等式符号(不用绝对值号)表示下列不等式的解。(3)[tex=4.714x1.571]ozgX2YS/Rwcz60/OB1BM8SmhuiXA0QafMe8Jp5znMoY=[/tex]
- 设[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]是有理数,满足[tex=9.214x2.929]wLLnuhaTkejykG34Lose4Gk3bDdglgIOUPyksgtxtXmt1sHAbktViJ8p1ePynplK3+wsNPKnCMhi2L94ONh39NTRjZdrdBEvRo1TQVd9L2o=[/tex],求[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]的值。
- 证明不等式[tex=10.929x2.571]dWrsryuu12Jfw+JXsmVJT6GgO9Y17xTK9/Q6HVoynSbX3U48VrBRvyCJhffV8Dar+T3QyhKQYgGm4h0ZCA6jsoXw791fBj1lGZWlgAhrvHo=[/tex],其中[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]、[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]是任意的非负实数.
- 随机变量[tex=0.5x1.286]cFLrzlMvECfU5CTqcvierw==[/tex]分别以概率0.4、[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]和[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]取值1、2、3、4,并且[tex=3.071x1.286]fknOBgzbjEu52cPH0WBW3g==[/tex],[tex=3.071x1.286]UAJJxdfCoB8SKuppr0cT/w==[/tex].求[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]、[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]。
- 设[tex=6.143x1.286]6rwJed1FsHiTTrZfLn+yQSSsHa3ksdJiBdvr4sYtaD8=[/tex],[tex=6.857x1.286]LmaePXUdmgsHYVP+pRbbkQfC+dsYW3KDGPZRbpTaNwg=[/tex],试用[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]表示向量[tex=3.214x1.286]wyo2V090esfyVpXpko/1wQ==[/tex]。
内容
- 0
设X为连续型随机变量,若[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]皆为常数,则下列等式中不恒成立的是 未知类型:{'options': ['[tex=8.929x1.357]PkEtH/pDQZCZQPWDfGJfpCr47ZyeOHOSQxPuBvVouIc=[/tex]', '[tex=5.0x1.357]sqH6r7YQVIMa84hRkVMwwQ==[/tex]', '[tex=6.214x1.286]r7KwjVSQWkObBARrqtRNeUQ5+//3heqTO5xSr2HubXU=[/tex]', '[tex=9.929x1.286]cV51IFAhucjdQSQLt/6a1yYAb13swT9V2+8C+B+bYbY=[/tex]'], 'type': 102}
- 1
已知:直线[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]、[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]、[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]是两两相交且不过同一点的四条直线,求证:直线[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]、[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]、[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]共面。
- 2
设[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]是互不相等的实数,且[tex=4.857x1.286]pz6BXMfR3fEU2s6/vRGU1pqY7wYpIAckH9HPLUpg30M=[/tex],[tex=4.857x1.286]vylqZ2Xr5MOP03GTmSmqHw==[/tex],[tex=4.786x1.286]36SQMYBDapeOE18TO40HbPE/QWKcXFEKAmEUl1XkU+w=[/tex],则[tex=0.571x1.286]XubEW9+1+hkJqH7jXe5MrA==[/tex],[tex=0.571x1.286]Hz6y44ELFVLLNrLVhO3CQA==[/tex],[tex=0.5x1.286]asctJDWpGaq/ETe64ANZ1Q==[/tex] A: 都大于0 B: 至少有一个大于0 C: 都不小于0 D: 至少有一个小于0 E: 都小于0
- 3
如果正数[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex],[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]满足[tex=6.143x1.286]ZmgY4IYKNAnTxjSaOa1RjQ==[/tex],那么 未知类型:{'options': ['[tex=4.429x1.286]LJI1FiqfFfvLk57V4PrnIg==[/tex],且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex],[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值唯一', '[tex=4.429x1.286]TX9Qz0sE7bWEvnntsBl/HA==[/tex],且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex],[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值唯一', '[tex=4.429x1.286]LJI1FiqfFfvLk57V4PrnIg==[/tex],且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex],[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值不唯一', '[tex=4.429x1.286]TX9Qz0sE7bWEvnntsBl/HA==[/tex],且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex],[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex],[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex],[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值不唯一', '以上均不正确'], 'type': 102}
- 4
设 [tex=2.286x1.286]mOMdkxPf8ug2R09NODY7dA==[/tex],问 [tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex] 、 [tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]取什么值时,积分[tex=6.286x2.857]k8MhqpV1Uo0+CAxNS7N/x9+cRcKF+6wnWRZ1jyGbU6aDMxhoFId1YyW6n7ro8dyLZ6R6oPcyMbFbRM6c6HUNyQ==[/tex]取得最大值?