Phân tích đa thức thành nhân tử: 5 x 2 + 10xy – 4x – 8y
A. 5 x - 2 y x + 4 y
B. 5 x 2 + 4 x - 2 y
C. x + 2 y 5 x - 4
D. 5 x - 4 x - 2 y
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\(1,\\ 1,=15\left(x+y\right)\\ 2,=4\left(2x-3y\right)\\ 3,=x\left(y-1\right)\\ 4,=2x\left(2x-3\right)\\ 2,\\ 1,=\left(x+y\right)\left(2-5a\right)\\ 2,=\left(x-5\right)\left(a^2-3\right)\\ 3,=\left(a-b\right)\left(4x+6xy\right)=2x\left(2+3y\right)\left(a-b\right)\\ 4,=\left(x-1\right)\left(3x+5\right)\\ 3,\\ A=13\left(87+12+1\right)=13\cdot100=1300\\ B=\left(x-3\right)\left(2x+y\right)=\left(13-3\right)\left(26+4\right)=10\cdot30=300\\ 4,\\ 1,\Rightarrow\left(x-5\right)\left(x-2\right)=0\Rightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\\ 2,\Rightarrow\left(x-7\right)\left(x+2\right)=0\Rightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\\ 3,\Rightarrow\left(3x-1\right)\left(x-4\right)=0\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=4\end{matrix}\right.\\ 4,\Rightarrow\left(2x+3\right)\left(2x-1\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{3}{2}\\x=\dfrac{1}{2}\end{matrix}\right.\)
1) \(3x\left(x-1\right)+5\left(x-1\right)\)
\(=\left(x-1\right)\left(3x+5\right)\)
2) \(4x(x-2y)-8y(2y-x)\)
\(=4x\left(x-2y\right)+8y\left(x-2y\right)\)
\(=\left(4x+8y\right)\left(x-2y\right)\)
\(=4\left(x+2y\right)\left(x-2y\right)\)
3) \(a^2\left(x-1\right)+b^2\left(1-x\right)\)
\(=a^2\left(x-1\right)-b^2\left(x-1\right)\)
\(=\left(a^2-b^2\right)\left(x-1\right)\)
\(=\left(a-b\right)\left(a+b\right)\left(x-1\right)\)
4) \(3x\left(x-a\right)+4a\left(a-x\right)\)
\(=3x\left(x-a\right)-4a\left(x-a\right)\)
\(=\left(x-a\right)\left(3x-4a\right)\)
5) \(5x\left(x-y\right)^2+10y^2\left(y-x\right)^2\)
\(=5x\left(x-y\right)^2+10y^2\left(x-y\right)^2\)
\(=\left(5x+10y^2\right)\left(x-y\right)^2\)
\(=5\left(x+2y^2\right)\left(x-y\right)^2\)
6) \(3x\left(x-3\right)^2+9\left(3-x\right)^2\)
\(=3x\left(x-3\right)^2+9\left(x-3\right)^2\)
\(=\left(3x+9\right)\left(x-3\right)^2\)
\(=3\left(x+3\right)\left(x-3\right)^2\)
7) \(x\left(m-a\right)^2-y\left(a-m\right)^2\)
\(=x\left(a-m\right)^2-y\left(a-m\right)^2\)
\(=\left(x-y\right)\left(a-m\right)^2\)
8) \(6y^2\left(x-1\right)^2+9y\left(1-x\right)^2\)
\(=6y^2\left(x-1\right)^2+9y\left(x-1\right)^2\)
\(=\left(6y^2+9x\right)\left(x-1\right)^2\)
\(=3\left(2y^2+3x\right)\left(x-1\right)^2\)
#Ayumu
a) \(-4x^2+10xy-14x\)
\(=2x\left(-2x+5y-7x\right)\)
b) \(3x\left(x-1\right)-y\left(1-x\right)+2x-2\)
\(=3x\left(x-1\right)+y\left(x-1\right)+2\left(x-1\right)\)
\(=\left(3x+y+2\right)\left(x-1\right)\)
Bài làm
a) -4x2 + 10xy - 14x
= 2x( -2x + 5y - 7 )
b) 3x( x - 1 ) - y ( 1 - x ) + 2x - 2
= 3x( x - 1 ) + y( x - 1 ) + 2( x - 1 )
= ( x - 1 )( 3x + y + 2 )
# Học tốt #
a: =x^2+5x-x-5
=(x+5)(x-1)
b: =4x^2-(y-3)^2
=(2x-y+3)(2x+y-3)
\(a,-2x^3y^4-4x^4y^3+2x^3y^3\)
\(=-2x^3y^3\left(y+x-1\right)\)
\(b,ab\left(x-5\right)-a^2\left(5-x\right)\)
\(=\left(x-5\right)\left(ab+a^2\right)\)
5 x 2 + 10 x y – 4 x – 8 y = 5 x 2 + 10 x y – 4 x + 8 y = 5 x x + 2 y – 4 x + 2 y = 5 x - 4 x + 2 y
Đáp án cần chọn là: C