bài 2 tìm GTLN a ) D = -3 – ( 1/2x + 5 ) b) E = 5 – ( y + 3/4 )^4

Question

bài 2 tìm GTLN
a ) D = -3 – ( 1/2x + 5 )
b) E = 5 – ( y + 3/4 )^4

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RI SƠ 6 years 2020-10-15T10:34:09+00:00 1 Answers 100 views 0

Answers ( )

  1. Ladonna
    0
    2020-10-15T10:35:45+00:00
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    `D=-3-|1/2x+5|`

    Vì -|1/2x+5|≤0`

    `→-3-|1/2x+5|≤-3`

    `→D≤-3`

    Dấu `=` xảy ra `↔1/2x+5=0↔1/2a=-5↔x=10`

    Vậy `D_(max) = -3 ↔x=10`

    `E=5-(y+3/4)^4`

    Vì -(y+3/4)^4≤0`

    `→5-(y+3/4)^4≤5`

    Dấu `=` xảy ra `↔y+3/4=0↔y=-3/4`

    Vậy `E_(max)=5↔y=-3/4` 

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )