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

Toán Lớp 9: √ ×-7 =5 ====-..

Toán Lớp 9: √ ×-7 =5 ………………………………………………

Comments ( 2 )

  1. \sqrt{x-7}=5  ( ĐKXĐ: x-7>=0<=>x>=7 )
    <=>x-7=5^2
    <=>x-7=25
    =>x=32 (TMĐKXĐ)
    Vậy x=32
     

  2. $\sqrt{x – 7}$ =5 ( ĐKXĐ: x – 7 $\ge$ 0 $\Leftrightarrow$ x $\ge$ 7) 
    $\Leftrightarrow$   x – 7   = 25
    $\Leftrightarrow$   x         =  32 ( KĐMKXD
     Vậy x = 32 

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