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xy(x + y) + yz(y + z) + xz(x + z) + 2xyz
= x 2 y + x y 2 + yz(y + z) + x 2 z + x z 2 + xyz + xyz
= ( x 2 y + x 2 z) + yz(y + z) + (x y 2 + xyz) + (x z 2 + xyz)
= x 2 (y + z) + yz(y + z) + xy(y+ z) + xz(y + z)
= (y + z)( x 2 + yz + xy + xz) = (y + z)[( x 2 + xy) + (xz + yz)]
= (y + z)[x(x + y) + z(x + y)] = (y + z)(x+ y)(x + z)
![](https://rs.olm.vn/images/avt/0.png?1311)
xy(x+y)+yz(y+z)+xz(x+z)+2xyz
= xy(x + y) + yz(y + z) + xyz + xz(x + z) + xyz
= xy(x + y) + yz(y + z + x) + xz(x + z + y)
= xy(x + y) + z(x + y + z)(y + x)
= (x + y)(xy + zx + zy + z2)
= (x + y)[x(y + z) + z(y + z)]
= (x + y)(y + z)(z + x)
Ta co :
Đặt tổng trên là A
A= xy(x+y)+yz(y+z)+xz(x+z)+2xyz
A= xy(x + y) + yz(y + z) + xyz + xz(x + z) + xyz
A= xy(x + y) + yz(y + z + x) + xz(x + z + y)
A= xy(x + y) + z(x + y + z)(y + x)
A= (x + y)(xy + zx + zy + z2 )
A= (x + y)[x(y + z) + z(y + z)]
A= (x + y)(y + z)(z + x)
![](https://rs.olm.vn/images/avt/0.png?1311)
xy(x+y)+yz(y+z)+xz(x+z)+2xyz
= xy(x + y) + yz(y + z) + xyz + xz(x + z) + xyz
= xy(x + y) + yz(y + z + x) + xz(x + z + y)
= xy(x + y) + z(x + y + z)(y + x)
= (x + y)(xy + zx + zy + z²)
= (x + y)[x(y + z) + z(y + z)]
= (x + y)(y + z)(z + x)
**** đi nak , làm rui đó
![](https://rs.olm.vn/images/avt/0.png?1311)
xy(x+y)+yz(y+z)+xz(x+z)+2xyz
= xy(x + y) + yz(y + z) + xyz + xz(x + z) + xyz
= xy(x + y) + yz(y + z + x) + xz(x + z + y)
= xy(x + y) + z(x + y + z)(y + x)
= (x + y)(xy + zx + zy + z²)
= (x + y)[x(y + z) + z(y + z)]
= (x + y)(y + z)(z + x)
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xy(x+y)+yz(y+z)+xz(x+z)+2xyz
= xy(x + y) + yz(y + z) + xyz + xz(x + z) + xyz
= xy(x + y) + yz(y + z + x) + xz(x + z + y)
= xy(x + y) + z(x + y + z)(y + x)
= (x + y)(xy + zx + zy + z²)
= (x + y)[x(y + z) + z(y + z)]
= (x + y)(y + z)(z + x)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(xy\left(x+y\right)+yz\left(y+z\right)+xz\left(x+z\right)+2xyz.\)
\(=x^2y+xy^2+y^2z+yz^2+xz\left(x+z\right)+2xyz\)
\(=\left(x^2y+xyz\right)+\left(xy^2+y^2z\right)+\text{(}yz^2+xyz\text{)}+xz\left(x+z\right)\)
\(=xy\left(x+z\right)+y^2\left(x+z\right)+yz\left(x+z\right)+xz\left(x+z\right)\)
\(=\left(x+z\right)\left(xy+y^2+yz+xz\right)\)
\(=\left(x+z\right)\text{[}y\left(x+y\right)+z\left(x+y\right)\text{]}\)
\(=\left(x+z\right)\left(x+y\right)\left(y+z\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(xy\left(x-y\right)+yz\left(y-z\right)+xz\left(z-x\right)\)
\(=xy\left(x-y\right)+yz\left[\left(y-x\right)-\left(z-x\right)\right]+xz\left(z-x\right)\)
\(=xy\left(x-y\right)-yz\left(x-y\right)-yz\left(z-x\right)+xz\left(z-x\right)\)
\(=\left(x-y\right)\left(xy-yz\right)-\left(z-x\right)\left(yz-xz\right)\)
\(=\left(x-y\right)\left(xy-yz\right)+\left(z-x\right)\left(xz-yz\right)\)
\(=\left(xy-yz\right)\left(x-y+z-x\right)\)
\(=\left(xy-yz\right)\left(-y+z\right)\)
mơn bn nha ^^
nh sáng nay lên lp thầy chữa bài thì kq nó k như z, cả cách lm nx :v
kq là: ( z - y )( x - z)( y - x )
\(xy\left(x-y\right)-xz\left(x+z\right)+yz\left(2x-y+z\right)\)
\(=xy\left(x-y\right)-xz\left(x+z\right)+yz\left(x-y+x+z\right)\)
\(=xy\left(x-y\right)-xz\left(x+z\right)+yz\left(x-y\right)+yz\left(x+z\right)\)
\(=\left(x-y\right)\left(xy+yz\right)-\left(xz-yz\right)\left(x+z\right)\)
\(=y\left(x-y\right)\left(x+z\right)-z\left(x-y\right)\left(x+z\right)\)
\(=\left(y-z\right)\left(x-y\right)\left(x+z\right)\)
Ta có :
xy(x−y)−xz(x+z)+yz(2x−y+z)
=xy(x−y)−xz(x+z)+yz(x−y+x+z)
=xy(x−y)−xz(x+z)+yz(x−y)+yz(x+z)
=(x−y)(xy+yz)−(xz−yz)(x+z)
=y(x−y)(x+z)−z(x−y)(x+z)
=(y−z)(x−y)(x+z)
P/s tham khảo nha