\(\frac{1}{8}x^3-\frac{3}{4}x^2+\frac{3}{2}x-1\)
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2.
pt <=> (x/2000 - 1) + (x+1/2001 - 1) + (x+2/2002 - 1) + (x+3/2003 - 1) + (x+4/2004 - 1 ) = 0
<=> x-2000/2000 + x-2000/2001 + x-2000/2002 + x-2000/2003 + x-2000/2004 = 0
<=> (x-2000).(1/2000 + 1/2001 + 1/2002 + 1/2003 + 1/2004) = 0
<=> x-2000=0 ( vì 1/2000 + 1/2001 + 1/2002 + 1/2003 + 1/2004 > 0 )
<=> x=2000
Tk mk nha
1.
a, = (2x-1)^2-2.(2x-1)+1-4
= (2x-1-1)^2-4
= (2x-2)^2-4
= (2x-2-2).(2x-2+2)
= 2x.(2x-4)
b, = [x.(x+3)].[(x+1).(x+2)]
= (x^2+3x).(x^2+3x+1)-8
= (x^2+3x+1)^2-1-8
= (x^2+3x+1)^2-9
= (x^2+3x+1-3).(x^2+3x+1+3)
= (x^2+3x-2).(x^2+3x+4)
= ((x+1).(x+3).(x^2+3x-2)
Tk mk nha
\(x^3+\frac{3}{2}x^2+\frac{3}{4}x+\frac{1}{8}=\left(x+\frac{1}{2}\right)^3\)
Bạn ghi sai đề nha
Hok tốt
\(x^3+\frac{3}{2}x^2+\frac{3}{2}x+\frac{1}{8}\)
\(=\left(x^3+\frac{3}{2}x^2+\frac{3}{4}x+\frac{1}{8}\right)+\frac{3}{2}x-\frac{3}{4}x\)
\(=\left(x+\frac{1}{2}\right)^3+\frac{3}{4}x\)
\(=\left(x+\frac{1}{2}\right)^3+\left(\sqrt[3]{\frac{3}{4}x}\right)^3\)
\(=\left(x+\frac{1}{2}+\sqrt[3]{\frac{3}{4}x}\right)\left[\left(x+\frac{1}{2}\right)^2-\left(x+\frac{1}{2}\right)\left(\sqrt[3]{\frac{3}{4}}\right)+\left(\sqrt[3]{\frac{3}{4}}\right)^2\right]\)
\(x^2+2x-8\)
\(=x^2+4x-2x-8\)
\(=x^2\left(x+4\right)-2\left(x+4\right)\)
\(=\left(x^2-2\right)\left(x+4\right)\)
\(x^2+5x+6\)
\(=x^2+2x+3x+6\)
\(=x\left(x+2\right)+3\left(x+2\right)\)
\(=\left(x+3\right)\left(x+2\right)\)
\(4x^2-12x+8\)
\(=4x^2-4x-8x+8\)
\(=4x\left(x-1\right)-8\left(x-1\right)\)
\(=\left(4x-8\right)\left(x-1\right)\)
\(x^2-xy-\dfrac{3}{4}y^2\)
\(=x^2-\dfrac{3}{2}xy+\dfrac{1}{2}xy-\dfrac{3}{4}y^2\)
\(=x\left(x-\dfrac{3}{2}y\right)+\dfrac{1}{2}y\left(x-\dfrac{3}{2}y\right)\)
\(=\left(x+\dfrac{1}{2}y\right)\left(x-\dfrac{3}{2}y\right)\)
x^3-5x2+8x-4=x3-2x2-3x2+6x+2x-4=x2(x-2)-3x(x-2)+2(x-2)
=(x-2)(x2-3x+2)
=(x-2)(x2-2x-x+2)=(x-2)(x-2)(x-1)=(x-2)2(x-1)
a, \(x^3-3x^2+3x-1=\left(x-1\right)^3\)
b, \(1-9x+27x^2-27x^3=-\left(3x-1\right)^3\)
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