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![](https://rs.olm.vn/images/avt/0.png?1311)
\(P=x^3+y^3+2021xy\)
\(=\left(x+y\right)^3-3xy\left(x+y\right)+2021xy\)
\(=\left(\dfrac{2021}{3}\right)^3-2021xy+2021xy\)
\(=\dfrac{8254655261}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(P=x^3+y^3+2021xy\)
\(=\left(x+y\right)^3-3xy\left(x+y\right)+2021xy\)
\(=\left(\dfrac{2021}{3}\right)^3=\dfrac{8254655261}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=2x^2+y^2-2x+2xy+2y+3=y^2+2y\left(x+1\right)+\left(x+1\right)^2+\left(x^2-4x+4\right)-2=\left(y+x+1\right)^2+\left(x-2\right)^2-2\ge-2\)
\(minA=-2\Leftrightarrow\)\(\left\{{}\begin{matrix}x=2\\y=-3\end{matrix}\right.\)
\(P=x^3+2021xy+y^3\)
\(=\left(x+y\right)^3-3xy\left(x+y\right)+2021xy\)
\(=\left(\dfrac{2021}{3}\right)^3\)
\(=\dfrac{8254655261}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 5
a) A = -x³ + 6x² - 12x + 8
= -x³ + 3.(-x)².2 - 3.x.2² + 2³
= (-x + 2)³
= (2 - x)³
Thay x = -28 vào A ta được:
A = [2 - (-28)]³
= 30³
= 27000
b) B = 8x³ + 12x² + 6x + 1
= (2x)³ + 3.(2x)².1 + 3.2x.1² + 1³
= (2x + 1)³
Thay x = 1/2 vào B ta được:
B = (2.1/2 + 1)³
= 2³
= 8
Bài 6
a) 11³ - 1 = 11³ - 1³
= (11 - 1)(11² + 11.1 + 1²)
= 10.(121 + 11 + 1)
= 10.133
= 1330
b) Đặt B = x³ - y³ = (x - y)(x² + xy + y²)
= (x - y)(x² - 2xy + y² + 3xy)
= (x - y)[(x - y)² + 3xy]
Thay x - y = 6 và xy = 9 vào B ta được:
B = 6.(6² + 3.9)
= 6.(36 + 27)
= 6.63
= 378
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x^3-3x+3y-y^3=\left(x-y\right)\left(x^2+xy+y^2\right)-3\left(x-y\right)=\left(x-y\right)\left(x^2+xy+y^2-3\right)\)
\(a,=\left(x-y\right)\left(x^2+xy+y^2\right)-3\left(x-y\right)\\ =\left(x-y\right)\left(x^2+xy+y^2-3\right)\\ b,=\left(x+2\right)^2-\left(x-1\right)^2\\ =\left(x+2-x+1\right)\left(x+2+x-1\right)\\ =3\left(2x+1\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (x - y)(x + y + 3). b) (x + y - 2xy)(2 + y + 2xy).
c) x 2 (x + l)( x 3 - x 2 + 2). d) (x – 1 - y)[ ( x - 1 ) 2 + ( x - 1 ) y + y 2 ].
![](https://rs.olm.vn/images/avt/0.png?1311)
c) \(3x+3y-x^2-2xy-y^2=3\left(x+y\right)-\left(x+y\right)^2=\left(x+y\right)\left(3-x-y\right)\)d) \(=\left(x+y\right)^3-\left(x+y\right)=\left(x+y\right)\left[\left(x+y\right)^2-1\right]\)
\(=\left(x+y\right)\left(x+y+1\right)\left(x+y-1\right)\)
\(c,=3\left(x+y\right)-\left(x+y\right)^2=\left(3-x-y\right)\left(x+y\right)\\ d,=\left(x+y\right)^3-\left(x+y\right)=\left(x+y\right)\left[\left(x+y\right)^2-1\right]\\ =\left(x+y\right)\left(x+y-1\right)\left(x+y+1\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(11^3-1\)
\(=11^3-1^3\)
\(=\left(11-1\right)\left(11^2+11\cdot1+1^2\right)\)
\(=10\cdot\left(121+11+1\right)\)
\(=10\cdot\left(132+1\right)\)
\(=10\cdot133\)
\(=1330\)
b) Ta có:
\(x^3-y^3\)
\(=\left(x-y\right)^3+3xy\left(x-y\right)\)
Thay \(x-y=6\) và \(xy=20\) ta có:
\(6^3+3\cdot20\cdot6=216+60\cdot6=216+360=576\)
a: 11^3-1=(11-1)(11^2+11+1)
=10*(121+12)
=10*133=1330
b: x^3-y^3=(x-y)^3+3xy(x-y)
=6^3+3*20*6
=216+360
=576
\(3x+3y=2021\)
\(\Leftrightarrow x+y=\dfrac{2021}{3}\)
\(P=x^3+y^3+2021xy\)
\(=\left(x+y\right)^3-3xy\cdot\left(x+y\right)+2021xy\)
\(=\left(\dfrac{2021}{3}\right)^3-3xy\cdot\dfrac{2021}{3}+2021xy\)
\(=\dfrac{8254655261}{27}\)