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2x( x - 1 ) - x( 1 - x )2 - ( 1 - x )3
= 2x( x - 1 ) - x( x - 1 )2 + ( x - 1 )3
= ( x - 1 )[ 2x - x( x - 1 ) + ( x - 1 )2 ]
= ( x - 1 )( 2x - x2 + x + x2 - 2x + 1 )
= ( x - 1 )( x + 1 )
Ta có: \(2x\left(x-1\right)-x\left(1-x\right)^2-\left(1-x\right)^3\)
\(=\left(x-1\right)\left(2x-x^2+x+x^2-2x+1\right)\)
\(=\left(x-1\right)\left(x+1\right)\)
1) \(x^3+x^2+4\)
\(=\left(x^3-x^2+2x\right)+\left(2x^2-2x+4\right)\)
\(=x\left(x^2-x+2\right)+2\left(x^2-x+2\right)\)
\(=\left(x^2-x+2\right)\left(x+2\right)\)
2) \(x^3-2x-4\)
\(=\left(x^3+2x^2+2x\right)-\left(2x^2+4x+4\right)\)
\(=x\left(x^2+2x+2\right)-2\left(x^2+2x+2\right)\)
\(=\left(x^2+2x+2\right)\left(x-2\right)\)
Sửa đề :
\(x^3+y^3+2x^2+2xy\)
\(=\left(x^3+y^3\right)+\left(2x^2+2xy\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2\right)+2x\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2+2x\right)\)
1.a) 2x4-4x3+2x2
=2x2(x2-2x+1)
=2x2(x-1)2
b) 2x2-2xy+5x-5y
=2x(x-y)+5(x-y)
=(2x+5)(x-y)
2.
a) 4x(x-3)-x+3=0
=>4x(x-3)-(x-3)=0
=>(4x-1)(x-3)=0
=> 2 TH:
*4x-1=0 *x-3=0
=>4x=0+1 =>x=0+3
=>4x=1 =>x=3
=>x=1/4
vậy x=1/4 hoặc x=3
b) (2x-3)^2-(x+1)^2=0
=> (2x-3-x-1).(2x-3+x+1)=0
=>(x-4).(3x-2)=0
=> 2 TH
*x-4=0
=> x=0+4
=> x=4
*3x-2=0
=>3x=0-2
=>3x=-2
=>x=-2/3
vậy x=4 hoặc x=-2/3
Ta có :
\(x^6+3x^5-2x^4+7x^3-2x^2+3x+1\)
\(=x^6-x^5+x^4+4x^5-4x^4+4x^3+x^4-x^3+x^2+4x^3-4x^2+4x+x^2-x+1\)
\(=x^4\left(x^2-x+1\right)+4x^3\left(x^2-x+1\right)+x^2\left(x^2-x+1\right)+4x\left(x^2-x+1\right)+\left(x^2-x+1\right)\)
\(=\left(x^2-x+1\right)\left(x^4+4x^3+x^2+4x+1\right)\)
\(a,\left(2x+3\right)\left(2x-3\right)-\left(2x+1\right)^2\)
\(=4x^2-9-4x^2-4x-1\)
\(=-4x-10\)
\(=-2\left(2x+5\right)\)
b,Tương tự
1) \(\left(3x+7\right)^2-\left(2x-3\right)^2=0\)
\(\Leftrightarrow\left(3x+7-2x+3\right)\left(3x+7+2x-3\right)=0\)
\(\Leftrightarrow\left(x+10\right)\left(5x+4\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x+10=0\\5x+4=0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-10\\x=\frac{-4}{5}\end{cases}}\)
Vạy ...
phần 2 tương tự áp dụng \(a^2-b^2=\left(a-b\right)\left(a+b\right)\)
\((4x-1)^2-(5-3x)^2=0\)
\(\Leftrightarrow(4x-1-5-3x)(4x+1+5-3x)=0\)
\(\Leftrightarrow(x-6)(x+6)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-6=0\\x+6=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=6\\x=-6\end{cases}}\)
Vậy : ...