bn ơi 2022+2021=4043 mà bn

a, (x-1).(x-2).(x-3)

= (x² - 2x - x + 2) . (x-3)

= (x² - 3x + 2). (x-3)4

= x³ - 3x² - 3x² + 9x + 2x -6

= x³ - 6x² + 11x -6

b) (x² +x+1)(x²-1)(x²-x+1)

= (x⁴ - x² + x³ - x+ x² -1) . (x² - x +1)

= (x⁴ + x³ -x -1) . (x² - x  +1)

= x⁶ - x⁵ + x⁴ + x⁵ - x⁴ + x³ - x² + x -1

= x⁶ + x³ - x² + x - 1

c) (2x-5)(4-3x)-(3x+11)(5-2x)-15(2x-5)

= (8x - 6x² - 20 + 15x) - (15x-6x+55-22x) - 30x + 75

= 8x - 6x² - 20 + 15x - 15x+6x-55+22x - 30x+75

= 6x-6x² +55

d)(x²-2x+3)(3x-5)-(x²+x-1)(2x+7)

làm tương tự phần C

lưu ý trước dấu ngoặc là dấu trừ, khi phá ngoặc ra phải đổi dấu



 

a: \(\left(x^2+x\right)^2+2\left(x^2+x\right)-8=0\)

\(\Leftrightarrow\left(x^2+x+4\right)\left(x^2+x-2\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x-1\right)=0\)

hay \(x\in\left\{-2;1\right\}\)

b: \(\Leftrightarrow\left(x-1\right)\left(x-3\right)\left(x+2\right)\left(x+4\right)+24=0\)

\(\Leftrightarrow\left(x^2+x-2\right)\left(x^2+x-12\right)+24=0\)

\(\Leftrightarrow\left(x^2+x\right)^2-14\left(x^2+x\right)+48=0\)

\(\Leftrightarrow\left(x^2+x-6\right)\left(x^2+x-8\right)=0\)

hay \(x\in\left\{-3;2;\dfrac{-1+\sqrt{33}}{2};\dfrac{-1-\sqrt{33}}{2}\right\}\)

a) A= (x-3)^2

thay x=203 vào 3, ta có 

A=(203-3)^2=200^2=40000

bạn  làm chi tiết ra cho mình đc ko ạ

\(a,=2x\left(x+3\right)\\ b,=x^3\left(x+3\right)+\left(x+3\right)=\left(x^3+1\right)\left(x+3\right)\\ =\left(x+1\right)\left(x+3\right)\left(x^2-x+1\right)\\ c,=64-\left(x-y\right)^2=\left(8-x+y\right)\left(8+x-y\right)\\ A=x^2+6x+5+x^3-8-x^2-x+2\\ A=x^3+5x-1\)

a) 2x²+6x=2x(x+3)
b) x⁴+3x³+x+3=(x⁴+x)+(3x³+3)=x(x³+1)+3(x³+1)=(x+3)(x³+1)
c) 64-x²-y²+2xy=-(x²-2xy+y²)+8²=8-(x+y)²=(8+x+y)(8-x-y)

A= (x+5)(x+1)+(x-2)(x²+2xx+4)-(x²+x-2)
A= x²+6x+5+x³-8-x²-x+2
A= x³+(x²-x²)+(6x-x)+(5-8+2)
A= x³+5x-1

a,5x^2 - 10xy + 5y^2 - 20z^2
=5(x^2 -2xy +y^2-4z^2 )
=5[(x-y)^2-(2z)^2 ]
=5 .(x-y-2z)(x-y+2z)

b,.= (5x^2+5xy)-(x+y)
=5x(x+y)-(x+y)
=(x+y)(5x-1)

d,x² - 4x + 3 = x² - x - 3x + 3
= x(x - 1) - 3(x - 1) = (x -1)(x - 3)

e,x² - x - 6 = x² +2x - 3x - 6
= x(x + 2) - 3(x + 2)
= (x + 2)(x - 3)

f,x² - x - 6 = x² +2x - 3x - 6
= x(x + 2) - 3(x + 2)
= (x + 2)(x - 3)

g,2x^2(3x - 5)
= 2x^2 x 3x - 2x^2 x 5
= 6x^3 - 10x^2

\(\text{1) }\)

\(\text{a) }5x^2-10xy+5y^2-20z^2\)

\(=5\left(x^2-2xy+y^2-4z^2\right)\)

\(=5\left[\left(x^2-2xy+y^2\right)-4z^2\right]\)

\(=5\left[\left(x-y\right)^2-\left(2z\right)^2\right]\)

\(=5\left(x-y+2z\right)\left(x-y-2z\right)\)

\(\text{b) }5x^2+5xy-x-y\)

\(=\left(5x^2-x\right)+\left(5xy-y\right)\)

\(=x\left(5x-1\right)+y\left(5x-1\right)\)

\(=\left(5x-1\right)\left(x+y\right)\)

\(\text{c) }2\left(x+4\right)-x^2+16\)

\(=2\left(x+4\right)-\left(x^2-16\right)\)

\(=2\left(x+4\right)-\left(x+4\right)\left(x-4\right)\)

\(=\left(x+4\right)\left(2-x+4\right)\)

\(=\left(x+4\right)\left(6-x\right)\)

\(\text{d) }x^2+4x+3\)

\(=x^2+3x+x+3\)

\(=\left(x^2+3x\right)+\left(x+3\right)\)

\(=x\left(x+3\right)+\left(x+3\right)\)

\(=\left(x+3\right)\left(x+1\right)\)

\(\text{e) }x^2+5x-6\)

\(=x^2+6x-x-6\)

\(=\left(x^2+6x\right)-\left(x+6\right)\)

\(=x\left(x+6\right)-\left(x+6\right)\)

\(=\left(x+6\right)\left(x-1\right)\)