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Bài toán: Cho ba số x,y,zx,y,z thỏa mãn x+y+z=0x+y+z=0 và x2+y2+z2=a2x2+y2+z2=a2....
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Bài toán: Cho ba số x,y,z" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:18.18px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x,y,z thỏa mãn x+y+z=0" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:18.18px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x+y+z=0 và x2+y2+z2=a2" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:18.18px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x2+y2+z2=a2. Tính x4+y4+z4" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:18.18px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">x4+y4+z4 theo a" role="presentation" style="border:0px; direction:ltr; display:inline-block; float:none; font-size:18.18px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">a.

 

 
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27 tháng 7 2016

vì a+b+c=0==> x=-(y+z) ==> \(x^2=\left(y+z\right)^2\)

<=> \(x^2=y^2+2yz+z^2\)

<=> \(x^2-y^2-z^2=2yz\)

<=> \(\left(x^2-y^2-z^2\right)^2=4y^2z^2\)

<=>\(x^4+y^4+z^4=2x^2y^2+2y^2z^2+2z^2x^2\)

<=> \(2\left(x^4+y^4+z^4\right)=\left(x^2+y^2+z^2\right)^2=a^4\)

==> \(x^4+y^4+z^4=\frac{a^4}{2}\)

7 tháng 10 2018

Ta có \(\hept{\begin{cases}\sqrt{4x-4}\ge0\\\sqrt{25x-5}\ge0\\\sqrt{81x-81}\ge0\end{cases}}\)

Mà \(\sqrt{4x-4}+\sqrt{25x-25}+\sqrt{81x-81}=-1\)

Nên pt trên vô nghiệm

P=√x−2√x−3+√x+1√x+3+x−4√x−99−xP=x−2x−3+x+1x+3+x−4x−99−xvà Q=√x+53−√xQ=x+53−x(vớix≥0;x≠9x≥0;x≠9)1, Rút gọn P2, Tìm x để P=33, Tìm M=P:QM=P:Q. Tìm x...
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x&#x2212;2x&#x2212;3+x+1x+3+x&#x2212;4x&#x2212;99&#x2212;x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-table; float:none; font-size:20.34px; font-style:normal; font-weight:normal; letter-spacing:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; text-align:left; text-indent:0px; text-transform:none; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">P=x2x3+x+1x+3+x4x99x x+53&#x2212;x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:20.34px; font-style:normal; font-weight:normal; letter-spacing:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; text-align:left; text-indent:0px; text-transform:none; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">Q=x+53x(vớix0;x9)

1, Rút gọn P

2, Tìm x để P=3

3, Tìm M=P:Q. Tìm x để 12" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:20.34px; font-style:normal; font-weight:normal; letter-spacing:normal; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; text-align:left; text-indent:0px; text-transform:none; white-space:nowrap; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">

 

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