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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
a) \(x^2-xy+4x-2y+4\)
\(=\left(x^2+4x+4\right)-\left(xy+2y\right)\\ =\left(x+2\right)^2-y.\left(x+2\right)\)
\(=\left(x+2\right).\left(x+2-y\right)\)
b) \(2x^2-5x-3\)
\(=2x^2+x-6x-3\)
\(=\left(2x^2+x\right)-\left(6x+3\right)=x\left(2x+1\right)-3\left(2x+1\right)\)
\(=\left(2x+1\right).\left(x-3\right)\)
c)\(\)
c);d);e) tạm thời tớ chưa nghĩ ra-.-"
tham khả tạm 2 câu ạ, chúc học tốt'.'
Bài 1:
a) (3x-2).(4x+5)-6x.(2x-1) = 12x^2 +15x - 8x -10 - 12x^2 + 6x = 13x - 10
b) (2x-5)^2 - 4.(x+3).(x-3) = 4x^2 - 20x + 25 - 4x^2 + 12x -12x + 36 = -20x + 61
Bài 2:
a)(2x-1)^2-(x+3)^2 = 0
<=> (2x-1-x-3).(2x-1+x+3) =0
<=>(x-4).(3x+2) = 0
<=> x-4 = 0 hoặc 3x+2=0
*x-4=0 => x=4
*3x+2 = 0 => 3x=-2 => x=-2/3
b)x^2(x-3)+12-4x=0 <=> x^2(x-3) - 4(x-3) =0 <=> (x-3).(x-2)(x+2) <=> x-3=0 hoặc x-2=0 hoặc x+2 =0
*x-3=0 => x=3
*x-2=0 =>x=2
*x+2=0 =>x=-2
c) 6x^3 -24x =0 <=> 6x(x^2 -4)=0 <=> 6x(x-2)(x+2)=0 <=> x=0 hoặc x-2 =0 hoặc x+2=0 <=> x=0 hoặc x=2 hoặc x=-2
\(3x\left(x-5\right)-x\left(4+3x\right)=43\)
\(\Leftrightarrow3x^2-15x-4x-3x^2=43\)
\(\Leftrightarrow-19x=43\)
\(\Leftrightarrow x=\frac{-43}{19}\)
\(a,x^3+9x^2+27x+27-27z^3\)
\(=\left(x+3\right)^3-\left(3z\right)^3\)
\(=\left(x+3-3z\right)\left(x^2+6x+9+3xz+9z+9z^2\right)\)
.........
\(b,\)
\(=\left(x+1\right)^2\left(x-3\right)+x\left(x-3\right)\)
\(=\left(x-3\right)\left(x^2+3x+1\right)\)
\(c,\)
\(=x^2\left(x^2+10\right)-2x\left(x^2+10\right)\)
\(=x\left(x-2\right)\left(x+10\right)\)
a) \(x^2+4x+3\)
\(=x^2+3x+x+3\)
\(=x\left(x+3\right)+\left(x+3\right)\)
\(=\left(x+1\right)\left(x+3\right)\)
a)(ab−1)2+(a+b)2
=a2b2−2ab+1+a2+2ab+b2
=a2b2+1+a2+b2=a2(b2+1)+(b2+1) = (a2+1)(b2+1)
c)x3−4x2+12x−27
=x3−27+(−4x2+12x)
=(x−3)(x2+3x+9)−4x(x−3)
=(x−3)(x2+3x+9−4x)
=(x−3)(x2−x+9)
b)x3+2x2+2x+1
=x3+2x2+x+x+1
=x(x2+2x+1)+(x+1)
=x(x+1)2+(x+1)
=(x+1)(x(x+1)+1)
=(x+1)(x2+x+1)
d)x4−2x3+2x−1
=x4−2x3+x2−x2+2x−1
=x2(x2−2x+1)−(x2−2x+1)
=(x2−2x+1)(x2−1)
=(x−1)2(x−1)(x+1)
=(x−1)3(x+1)
e)x4+2x3+2x2+2x+1
=x4+2x3+x2+x2+2x+1
=x2(x2+2x+1)+(x2+2x+1)
=(x2+2x+1)(x2+1)
=(x+1)2(x2+1)