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

Toán Lớp 7: Giúp em với (x-8,9)^4 + (y+1,5)^6=0

Toán Lớp 7: Giúp em với (x-8,9)^4 + (y+1,5)^6=0

Comments ( 2 )

  1. (x-8,9)^4 + (y+1,5)^6=0
    Ta có
    =>\(\left[ \begin{array}{l}(x-8,9)^4\geq0\\(y+1,5)^6\geq0 \end{array} \right.\) 
    Mà (x-8,9)^4 + (y+1,5)^6=0 nên:
    =>\(\left[ \begin{array}{l}(x-8,9)^4=0\\(y+1,5)^6=0 \end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x-8,9=0\\y+1,5=0 \end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=8,9\\y=-1,5 \end{array} \right.\) 

  2. $(x-8,9)^4 + (y+1,5)^6=0$
    $⇔ \begin{cases}x-8,9=0\\y+1,5=0\end{cases}$
    $⇔ \begin{cases}x=8,9\\y=-1,5\end{cases}$

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