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

Toán Lớp 7: Helppppppppppppppppp meeeeeeeeeeeeeeeeeeee (x+`3/4`)^2=`9/16`

Toán Lớp 7: Helppppppppppppppppp meeeeeeeeeeeeeeeeeeee
(x+3/4)^2=9/16

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     (x+3/4)^2 = 9/16
    <=> (x+3/4)^2 = (3/4)^2
    <=> \(\left[ \begin{array}{l}x+3/4=3/4\\x+3/4=-3/4\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=3/4 – 3/4 \\x=-3/4 – 3/4\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=0\\x=-6/4\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=0\\x=-3/2\end{array} \right.\) 
    Vậy x∈{0;-3/2}

  2. Giải đáp + Lời giải và giải thích chi tiết:
    (x+3/4)^2=9/16
    => (x+3/4)^2=(±3/4)^2
    TH1 :
    x + 3/4 = 3/4
    x = 3/4-3/4
    x = 0
    TH2 : 
    x + 3/4=-3/4
    x = -3/4-3/4
    x = -6/4
    x = -3/2 
    Vậy x ∈ {0,-3/2}
    # Rítttt ???? (ㆁωㆁ)

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

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