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a ) \(\left(x+y\right)^5=x^5+5x^4y+10x^3y^2+5xy^4+y^5\)
b ) \(\left(x-3y\right)^6=\left[x+\left(-3y\right)\right]^6\)
\(=x^6+6x^5\left(-3y\right)+15x^4\left(-3y\right)^2+20x^3\left(-3y\right)^3+15x^2\left(-3y\right)^4+6x\left(-3y\right)^5+\left(-3y\right)^6\)
\(=x^6-18x^5y+135x^4y^2-540x^3y^3+1215x^2y^4-1458xy^5+729y^6\)
Chúc bạn học tốt
a: Ta có: \(\left(x+y\right)^3-\left(x-y\right)^3\)
\(=x^3+3x^2y+3xy^2+y^3-x^3+3x^2y-3xy^2+y^3\)
\(=6x^2y+2y^3\)
\(\left(x+y\right)^3=x^3+3x^2y+3xy^2-y^3\)
\(\left(x-y\right)^3=x^3-3x^2y+3xy^2-y^3\)
\(\left(2y-3\right)^3=8y^3-36y^2+54y-27\)
a: Ta có: \(\left(x+y\right)^3-\left(x-y\right)^3\)
\(=x^3+3x^2y+3xy^2+y^3-x^3+3x^2y-3xy^2+y^3\)
\(=6x^2y+2y^3\)
1, \(x^3+3^3=\left(x+3\right)\left(x^2-3x+9\right)\)
2, đề sai
3, \(x^3+8=\left(x+2\right)\left(x^2-2x+4\right)\)
4, \(x^3-64=\left(x-4\right)\left(x^2+4x+16\right)\)
5, \(1000-y^3=\left(10-y\right)=\left(100+10y+y^2\right)\)
tương tự ...
8, \(8x^3+27y^3=\left(2x+3y\right)\left(4x^2-6xy+9y^2\right)\)
Câu 2 đề ko sai nha bạn.
2) x2 - (\(\sqrt{y^3}\))2 ( y>0)
= ( x -\(\sqrt{y^3}\)) ( x +\(\sqrt{y^3}\))
\(\left(x^3-1\right)\left(x^3+1\right)=\left(x^3\right)^2-1^2=x^6-1\)
\(\left(x^3-1\right)\left(x^3+1\right)\)
\(=\left(x^3\right)^2-1^2\)
\(=x^3-1\)
Z thôi T nha
a) (x² + 2)²
= (x²)² + 2.x².2 + 2²
= x⁴ + 4x² + 4
b) (x + y + z)²
= [(x + y) + z]²
= (x + y)² + 2(x + y).z + z²
= x² + 2xy + y² + 2xz + 2yz + z²
= x² + y² + z² + 2xy + 2xz + 2yz
a) (x - 1/2x²y)²
= x² - 2x . 1/2 x²y + (1/2x²y)²
= x² - x³y + 1/4 x⁴y²
b) (2xy² - 1)(1 + 2xy²)
= (2xy²)² - 1²
= 4x²y⁴ - 1
c) (x - y + 2)²
= (x - y)² + 2(x - y).2 + 2²
= x² - 2xy + y² + 4x - 4y + 4
= x² + y² - 2xy + 4x - 4y + 4
d) (x + 1/2)(1/2 - x)
= (1/2)² - x²
= 1/4 - x²
e) (x² - 1/3)²
= (x²)² - 2x².1/3 + (1/3)²
= x⁴ - 2/3 x² + 1/9
\(\left(x+\dfrac{y}{x}\right)^3\)
\(=x^3+3.x^2.\dfrac{y}{x}+3.x.\left(\dfrac{y}{x}\right)^2+\left(\dfrac{y}{x}\right)^3\)
\(=x^3+3xy+3.\dfrac{y^2}{x}+\dfrac{y^3}{x^3}\)