\(x^2-2xy+x-2y\)
\(=x\left(x-2y\right)+\left(x-2y\right)\)
\(=\left(x+1\right)\left(x-2y\right)\)
x 2 − 2 x y + x − 2 y = x ( x − 2 y ) + ( x − 2 y ) = ( x + 1 ) ( x − 2 y )
\(x^2-2xy+x-2y\)
\(=x\left(x-2y\right)+\left(x-2y\right)\)
\(=\left(x+1\right)\left(x-2y\right)\)
x 2 − 2 x y + x − 2 y = x ( x − 2 y ) + ( x − 2 y ) = ( x + 1 ) ( x − 2 y )
Tính 1 cách hợp lí x/x^2+2xy+y^2 + 2y/x+y + y/x^2+2xy+y^2=?
Cho xy/x^2+y^2=5/8 rút gọn p=
x^2-2xy+y^2/x^2+2xy+y^2
x2-2xy+y2-xy+yz
y-x2y-2xy2-y3
x2-25+y2+2xy
(x+y)2-(x2-y2)
x2+4x-y2+4
2xy-x2-y2+16
x2-2x-4y2-4y
cho (x+2y)(x^2-2xy+y^2)=0 và (x-2y)(x^2+2xy+4y^2)=16 tìm x và y
Cho xy/x^2+y^=5/8. Rút gọn phân thức P= x^2-2xy+y^2/x^2+2xy+y^2
a xy -2x -y^2 +2y
b x^2 - 2xy +y^2 -x +y
c x^2 -1 -2xy +2y
d (x+3)^2 -(2x -5)(x+3)
x2+y2=(x+y)2-2xy hoặc (x-y)2+2xy
Tìm x, y thuộc Z để:
a) xy + x - y = 2
b) x - 2xy + y = 0
c) x. (x - 2) - (2 - x)y - 2. (x - 2) = 3
d) (2x - y). (4x2 + 2xy + y2) + (2x + y). (4x2 - 2xy + y2) - 16x. (x2 - y) = 32
e) x2 - 2xy + 2y2 - 2x + 6y +5 = 0
g) x2 + 2xy + 7x + 7y + 2y2 = 0
cho (x+2y)(x^2-2xy+y^2) = 0 và (x-2y)(x^2+2xy+y^2) = 16 . Tính A=(xy)^2016
B=\(\dfrac{x^{2^{ }}+y^2-z^2+2xy}{x^2+z^{2^{ }}-y^2-2xy}\)
rút gọn