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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tìm GTLN: B= $- x^{2}$ -2x+10 Giải giúp e

Toán Lớp 7: Tìm GTLN:
B= $-
x^{2}$ -2x+10
Giải giúp e

Comments ( 2 )

  1. B=-x²-2x+10
    B=-x²-2x-1+11
    B=-(x²+2x+1)+11
    B=-(x+1)²+11
    (x+1)²≥0⇒-(x+1)²≤0⇒-(x+1)²+11≤11
    ⇒GTLN B là: 11
    Dấu bằng xảy ra khi:
    -(x+1)²=0
    x+1=0
    x=-1
    Cho mk xin hay nhất please
    Thank you
     

  2.    $-x^2-2x+10^{}$
    =$-x^2-2x-1+11^{}$ 
    =$-(x+1)^2+11^{}$ $\leq$ $11^{}$ ∀ $x^{}$ $\in$ Z
    Dấu bằng xảy ra khi $-(x+1)^{2}$=$0^{}$
    ⇒$x=-1^{}$
    Vậy GTLN của $-x^2-2x+10^{}$ là $11^{}$ ⇔ $x=-1^{}$

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222-9+11+12:2*14+14 = ? ( )

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