Toán Lớp 7: x-1 ^ 5 = x-1 ^ 3 giúp mình cần gấp
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Toán Lớp 7: x-1 ^ 5 = x-1 ^ 3 giúp mình cần gấp
Comments ( 2 )
<=>(x-1)^5-(x-1)^3=0
<=>(x-1)^3[(x-1)^2-1]=0
<=>(x-1)^3(x-1-1)(x-1+1)=0
<=>(x-1)^3.x.(x-2)=0
<=>\(\left[ \begin{array}{l}(x-1)^3=0\\x=0\\x-2=0\end{array} \right.\)
<=>\(\left[ \begin{array}{l}x-1=0\\x=0\\x-2=0\end{array} \right.\)
<=>\(\left[ \begin{array}{l}x=1\\x=0\\x=2\end{array} \right.\)
Vậy : x in {0; 1; 2}