\(a,2\left(x-y\right)\left(x+y\right)+\left(x+y\right)^2+\left(x-y\right)^2\)
\(=2\left(x^2-y^2\right)+x^2+2xy+y^2+x^2-2xy+y^2\)
\(=2x^2-2y^2+x^2+2xy+y^2+x^2-2xy+y^2\)
\(=4x^2\)
a,2(x-y)(x+y)+(x+y)2+(x-y)2
=2(x2-y2)+x2+2xy+y2+x2-2xy+y2
=4x2
b,=x2
khỏi viết đề nhs
A/2(x2 -y2 )+x2 +2xy+y2 +x2 -2xy+y2
= 2x 2-2y2 +x 2+2xy+y2+x2-2xy+y2
=4x2
B/x2 -y2 +z2 +z2 -2zy+y2 +2x-2y+2z+2y-2z+xy-xz-y2 +yz+xy-xz
=mấy bạn tự rút gọn nhé ! k giùm lun
a) \(\left(x+y\right)^2+2\left(x-y\right)\left(x+y\right)+\left(x-y\right)^2=\left[\left(x+y\right)+\left(x-y\right)\right]^2=\left(2x\right)^2=4x^2\)
b) \(\left(x-y+z\right)^2+\left(z-y\right)^2+2\left(x-y+z\right)\left(y-z\right)=\left[\left(x-y+z\right)+\left(y-z\right)\right]^2=x^2\)
