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a, \(\left(25y^2+\dfrac{1}{9}x^2+\dfrac{5}{3}xy\right)\left(5y-\dfrac{1}{3}x\right)\)
Nó tự phân tích cho rồi nha bạn!
b, \(-125y^3-\dfrac{1}{27}x^3\)
\(=\left(-5y\right)^3-\left(\dfrac{1}{3}x\right)^3\)
\(=\left(-5y-\dfrac{1}{3}x\right)\left(25y^2-\dfrac{5}{3}xy+\dfrac{1}{9}x^2\right)\)
Chúc bạn học tốt!!!
Câu a :
\(\left(25y^2+\dfrac{1}{9}x^2+\dfrac{5}{3}xy\right)\left(5y-\dfrac{1}{3}x\right)\)
\(=\left(5y+\dfrac{1}{3}x\right)^2\left(5y-\dfrac{1}{3}x\right)\)
Câu b :
\(-125y^3-\dfrac{1}{27}x^3\)
\(=\left(-5y\right)^3-\left(\dfrac{1}{3}x\right)^3\)
\(=\left(-5y-\dfrac{1}{3}x\right)\left(25y^2+\dfrac{5}{3}xy+\dfrac{1}{9}x^2\right)\)
\(27x^3+125y^3\)
\(=\left(3x\right)^3+\left(5y\right)^3\)
\(=\left(3x+5y\right)\left(9x^2-15xy+25y^2\right)\)
\(16x^2-24xy+9y^2\)
\(=\left(4x\right)^2-2.4x.3y+\left(3y\right)^2\)
\(=\left(4x-3y\right)^2\)
a) 2x(y-2009)+5y(y-2009)
=(y-2009)(2x+5y)
b) 35x(y-8)-14y(8-y)
=35x(y-8)+14y(y-8)
=7(y-8)(5x+2y)
c) 15x^2 +10xy =5x(3x+2y)
d)24x-18y+30= 6(4x+3y+10)
e) x^2 +14x+49
= x^2 +2.7.x+ 7^2
=(x+7)^2
i) x^2 -x - y^2 - y
=(x^2 -y^2)-(x+y)
=(x-y)(x+y)-(x+y)
=(x+y)(x-y-1)
k) x^2 -2xy+y^2 -z^2
=(x^2 -2xy+y^2) -z^2
=(x-y)^2 -z^2
= (x-y-z)(x-y+z)
a) \(2x\left(y-2009\right)+5y\left(y-2009\right)\) \(=\left(y-2009\right)\left(2x+5y\right)\)
b) \(35x(y-8)-14y(8-y)\) \(=35x\left(y-8\right)+14y\left(y-8\right)\)
\(=\left(y-8\right)\left(35x+14y\right)\)
\(=\left(y-8\right).7\left(5x+2y\right)\)
c) \(15x^2+10xy=5x\left(3x+2y\right)\)
d) \(24x-18y+30=3\left(8x-6y+10\right)\)
e) \(x^2+14x+49=x^2+2.7.x+7^2\)
\(=\) \((x+7)^2\)
g) \(27x^3+y^3\) \(=\left(3x+y\right)\left(9x^2-3xy+y^2\right)\)
h) \(8x^3-\dfrac{1}{125}y^3=\left(2x-\dfrac{1}{5}y\right)\left(4x^2+\dfrac{2}{5}xy+\dfrac{1}{25}y^2\right)\)
i) \(x^2-x-y^2-y=\left(x^2-y^2\right)-\left(x+y\right)\)
\(=\left(x-y\right)\left(x+y\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(x-y-1\right)\)
k) \(x^2-2xy+y^2-z^2=\left(x^2-2xy+y^2\right)-z^2\)
\(=\left(x-y\right)^2-z^2\)
\(=\left(x-y-z\right)\left(x-y+z\right)\)
- HỌC TỐT NHA BẠN YÊU ^^ -
( 2x - 5y )( 4x2 + 10xy + 25y2 )
=( 2x )3 - ( 5y )3
= 8x3 - 125y3
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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Bài 1:
\(a,27x^3+27x^2+9x+1\)
\(=\left(3x\right)^3+3.\left(3x\right)^2.1+3.3x.1^2+1^3\)
\(=\left(3x+1\right)^3\)
\(b,x^3+3\sqrt{2}x^2y+6xy^2+2\sqrt{2}y^3\)
\(=x^3+3.x^2.\sqrt{2}y+3.x.\left(\sqrt{2}y\right)^2+\left(\sqrt{2}y\right)^3\)
\(=\left(x+\sqrt{2}y\right)^3\)
Bài 2:
\(a,x^3+9x^2+27x+27=0\)
\(\Leftrightarrow\left(x+3\right)^3=0\)
\(\Leftrightarrow x+3=0\Leftrightarrow x=-3\)
\(b,\left(x+1\right)^3-x\left(x-2\right)^2+x-1=0\)
\(\Leftrightarrow x^3+3x^2+3x+1-x^3-4x^2+4x+x-1=0\)
\(\Leftrightarrow-x^2+8x=0\)
\(\Leftrightarrow-x\left(x-8\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)
1)
a) = (3x+1)3
b) (x+\(\sqrt{2}\) )3
2)
a)\(x^3+9x^2+27x+27=0\\ \left(x+3\right)^3=0\\ =>x=-3\)
b) Bài cuối bạn tự làm nhé! Mình mắc học bài
# Chúc bạn học tốt !
\(x^6-125y^3=\left(x^2\right)^3-\left(5y\right)^3=\left(x^2-5y\right)\left(x^4+5x^2y+25y^2\right)\)
\(27x^3+125y^3\)
\(=\left(3x\right)^3+\left(5y\right)^3\)
\(=\left(3x+5y\right)\left[\left(3x\right)^2-3x\cdot5y+\left(5y\right)^2\right]\)
\(=\left(3x+5y\right)\left(9x^2-15xy+25y^2\right)\)