thay x = 7  vào biểu thức, ta đc:

\(P=\left(7-4\right)^{\left(7-5\right)^{\left(7-6\right)^{\left(7+6\right)^{\left(7+5\right)}}}}=3^{2^{1^{13^{12}}}}\)

\(=3^{2^1}=9\)

\(\left(x-6\right)^{\left(x+6\right)^{\left(x+5\right)}}=\left(7-6\right)^{\left(7+6\right)^{\left(7+5\right)}}=1^{13^{12}}=1\)

=> P(1) = \(\left(7-4\right)^{\left(7-5\right)^1}=3^2=9\)

= 9 nha cho mèo ú vài k nha các bạn !!!!!

Ta có x-6=7-6=1

=>A=(x-4)^(x-5)=(7-4)^(7-5)=3²=9

Vậy giá trị của A tại x=7 là 9

Thay x = 7 vào p, ta đc:

\(p=\left(7-4\right)^{\left(7-5\right)^{\left(7-6\right)^{\left(7+6\right)^{7+5}}}}\)

     \(=3^{2^{1^{13^{12}}}}=9\)

Vì | x-1| ; |x+2|; |x-3| ; |x+4| ; |x-5|; |x+6| ; |x-7| ; |x+8| ; |x-9| luôn luôn < hoặc = 0

vì vậy min của T =0

\(T=|x-1|+|x+2|+|x-3|+|x+4|+|x-5|+|x+6|+|x-7|+|x+8|+|x-9|\)

\(\Rightarrow T=|x-1|+|x+2|+|3-x|+|x+4|+|5-x|+|x+6|+|7-x|+|x+8|+|9-x|\)

\(\Rightarrow T\ge|x-1+x+2+3-x+x+4+5-x+x+6+7-x+x+8+9-x|\)

\(\Rightarrow T\ge|43|\)

\(\Rightarrow T\ge43\)

Vậy \(Min_T=43\)

Aaaaa! Nãy tui bị ngu vậy mới đúng nè hay sao ý @@

\(T=|x-1|+|x+2|+|x-3|+|x+4|+|x-5|+|x+6|+|x-7|+|x+8|+|x-9| \)

\(\Rightarrow\)\( T=|1-x|+|x+2|+|3-x|+|x+4|+|5-x|+|x+6|+|7-x|+|x+8|+|9-x| \)

\(T\ge\)\( |1-x +x+2+3-x+x+4+5-x+x+6+7-x+x+8+9-x| \)

\(\Rightarrow T\ge|44-x|\)

Vậy GTNN của x = 44 khi x = 0

Bài 2:

\(B=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right).......\left(1-\frac{1}{2004}\right)\)

\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}....\frac{2003}{2004}\)

\(=\frac{1}{2004}\)

Bài 2

=1/2 x 2/3 ... x 2003/2004

=1/2004

2.

1/2004

sudy well

study well

đk : \(x\ge0,x\ne1\)

\(=>P=\left[\dfrac{2\left(\sqrt{x}+2\right)-5}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+2\right)}\right]:\left[\dfrac{x+\sqrt{x}-2+3-x}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+2\right)}\right]\)

\(P=\left[\dfrac{2\sqrt{x}-1}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+2\right)}\right].\left[\dfrac{\left(\sqrt{x}-1\right)\left(\sqrt{x}+2\right)}{\sqrt{x}+1}\right]\)

\(P=\dfrac{2\sqrt{x}-1}{\sqrt{x}+1}\)

b,\(x=6-2\sqrt{5}=\left(\sqrt{5}-1\right)^2\) thay vào P

\(=>P=\dfrac{2\sqrt{\left(\sqrt{5}-1\right)^2}-1}{\sqrt{\left(\sqrt{5}-1\right)^2}+1}=\dfrac{2\sqrt{5}-3}{\sqrt{5}}\)

c,\(=>\dfrac{2\sqrt{x}-1}{\sqrt{x}+1}=\dfrac{1}{\sqrt{x}}=>2x-\sqrt{x}=\sqrt{x}+1\)

\(=>2x-2\sqrt{x}-1=0< =>2\left(x-\sqrt{x}-\dfrac{1}{2}\right)=0\)

\(=>x-\sqrt{x}-\dfrac{1}{2}=>\Delta=1-4\left(-\dfrac{1}{2}\right)=3>0=>\left[{}\begin{matrix}x1=\dfrac{1+\sqrt{3}}{2}\\x2=\dfrac{1-\sqrt{3}}{2}\end{matrix}\right.\)

đối chiếu đk loại x2 còn x1 thỏa

Chắc là \(q\left(x\right)=x^2-4????\)

\(f\left(2\right)=2^5+2^2+1=37\) ; \(f\left(-2\right)=-27\)

Do \(f\left(x\right)\) có 5 nghiệm nên f(x) có dạng:

\(f\left(x\right)=\left(x-x_1\right)\left(x-x_2\right)\left(x-x_3\right)\left(x-x_4\right)\left(x-x_5\right)\)

\(\Rightarrow f\left(2\right)=\left(2-x_1\right)\left(2-x_2\right)\left(2-x_3\right)\left(2-x_4\right)\left(2-x_5\right)=37\)

\(f\left(-2\right)=\left(-2-x_1\right)\left(-2-x_2\right)\left(-2-x_3\right)\left(-2-x_4\right)\left(-2-x_5\right)=-27\)

\(\Rightarrow\left(2+x_1\right)\left(2+x_2\right)\left(2+x_3\right)\left(2+x_4\right)\left(2+x_5\right)=27\)

\(A=\left(x_1^2-4\right)\left(x^2_2-4\right)\left(x_3^2-4\right)\left(x_4^2-4\right)\left(x^2_5-4\right)\)

\(A=-\left(2-x_1\right)\left(2-x_2\right)\left(2-x_3\right)\left(2-x_4\right)\left(2-x_5\right)\left(2+x_1\right)\left(2+x_2\right)\left(2+x_3\right)\left(2+x_4\right)\left(2+x_5\right)\)

\(A=-37.27=-999\)

\(\frac{x\left(x+5\right)+y\left(y+5\right)+2\left(xy-3\right)}{x\left(x+6\right)+y\left(y+6\right)2xy}\)

=\(\frac{x^2+5x+y^2+5y+2xy-3}{x^2+6x+y^2+6y+2xy}\)

triệt tiêu x²;y²;2xy ta được:

\(\frac{5x+5y-3}{6x+6y}=\frac{5\left(x+y\right)-3}{6\left(x+y\right)}\)

=\(\frac{5.2010-3}{6.2010}=\frac{3349}{4020}\)