Tính chia:
(x^2-y^2+6x+9):(x+y+3).
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ban chu y nhe
x^2-y^2+6x+9 = (x^2 +6x+9)-y^2(sử dụng hđt a^2+2ab+b^2=(a+b)^2 )
=(x+3)^2-y^2 (sử dụng hđt a^2 - b^2= (a+b)(a-b)
=(x+3+y)(x+3-y)
=>(x^2 -y^2+6x+9)/(x+y+3)=x-y+3
chúc may mắn
mik ko biết viết số mũ thông cảm
\(x^2-y^2+6x+9=\left(x^2+6x+9\right)-y^2=\left(x+3\right)^2-y^2=\left(x+y+3\right)\left(x-y+3\right)\)
Vậy \(\left(x^2-y^2+6x+9\right):\left(x+y+3\right)=x-y+3\)
Ta có: x2-y2+6x+9= (x2+6x+9)-y2
= (x+3)2 - y2
= (x+y+3)(x-y+3)
Suy ra: (x2-y2+6x+9):( (x+y+3) = (x+y+3)(x-y+3) : (x+y+3) = x-y+3
bạn chú ý nhé
x^2-y^2+6x+9 = (x^2 +6x+9)-y^2(sử dụng hđt a^2+2ab+b^2=(a+b)^2 )
=(x+3)^2-y^2 (sử dụng hđt a^2 - b^2= (a+b)(a-b)
=(x+3+y)(x+3-y)
=>(x^2 -y^2+6x+9)/(x+y+3)=x-y+3
chúc may mắn
(x2– y2 + 6x + 9) : (x + y + 3) = (x2 + 6x+ 9) – y2 : (x + y + 3)
=(x + 3)2 – y2 : (x + y + 3) = (x + 3 – y) (x + 3 + y) : (x + y + 3) = (x – y + 3)
\(\left(6x^3-7x^2-x+2\right):\left(2x+1\right)\)
\(=\left(x+\frac{1}{2}\right)\left(x-1\right)\left(x-\frac{2}{3}\right):\left(x+\frac{1}{2}\right)\)
\(=\left(x-1\right)\left(x-\frac{2}{3}\right)\)
a) Ta có: 6x^3 - 7x2 - x+2 = 6x3+3x2-10x2-5x+4x+2
= 3x2 ( 2x+1) - 5x(2x+1) + 2(2x+1)
= (2x+1)(3x2-5x+2)
Suy ra: (6x3-7x2-x+2): (2x+1)= 3x2-5x+2
b) Ta có: x2 -y2+6x+9= (x2+6x+9) - y2
= (x+3)2 - y2
= (x+3-y)(x+3+y)
Suy ra: (x2-y2+6x+9): (x+y+3)= x-y+3
Làm vậy nha pạn :)
1) Ta có:
x³ + y³ + z³ - 3xyz = (x+y)³ - 3xy(x-y) + z³ - 3xyz
= [(x+y)³ + z³] - 3xy(x+y+z)
= (x+y+z)³ - 3z(x+y)(x+y+z) - 3xy(x-y-z)
= (x+y+z)[(x+y+z)² - 3z(x+y) - 3xy]
= (x+y+z)(x² + y² + z² + 2xy + 2xz + 2yz - 3xz - 3yz - 3xy)
= (x+y+z)(x² + y² + z² - xy - xz - yz).
Câu 2:
\(\frac{x^2-y^2+6x+9}{x+y+3}\)
\(=\frac{x^2-y^2+x^2+6x+9-x^2}{x+y+3}\)
\(=\frac{ \left(x+3\right)^2-y^2}{x+y+3}\)
\(=\frac{\left(x-y+3\right)\left(x+y+3\right)}{x+y+3}\)
\(=x-y+3\)
\(\frac{x^2-y^2+6x+9}{x+y+3}\)
\(=\frac{\left(x^2+6x+9\right)-y^2}{x+y+3}\)
\(=\frac{\left(x+3\right)^2-y^2}{x+y+3}\)
\(=\frac{\left(x+3+y\right)\left(x+3-y\right)}{x+y+3}\)
\(=x+3-y\)