• 2022-06-17
    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。(2)[tex=5.571x1.357]pEde81279qyokvSzSIpG+A==[/tex]
  • 由[tex=5.571x1.357]pEde81279qyokvSzSIpG+A==[/tex]知[tex=2.357x1.143]xEqY+0XhWcn4tV7HEuI/FQ==[/tex],且[tex=10.214x1.357]15r5CVIfOCl44GFHdXGZimo1IUm9WTy6trZyRNZVpmc=[/tex]仅当[tex=2.357x1.071]d4kOCnfGYbVk9XymAcQ5dQ==[/tex]时有解[tex=3.929x2.429]99KVh2B+SQO1dRFbOqtNQg==[/tex],即 [tex=6.214x4.071]fnpmC2J6JmQBLyo5NmGAzwG5WuoBM6lv3OqX4P79NG5cyySDR6KbT8BSP70B12L3on9fIX2k51WktSVQpxYjn/XfG/8Z9oKXIBM85Jcs/Xs=[/tex]

    举一反三

    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?