D
duchieu456


dai so
Bai 3 thu gon bieu thuc sau
a) x(y-z ) +y(z-x )+ z (x+y)
b) (x -y+z )- (x -y-z) +(x+y-z ) -(x+y+z)
to ko danh dau de bai nhe giai ho tto
Bai 3 thu gon bieu thuc sau
a) x(y-z ) +y(z-x )+ z (x+y)
b) (x -y+z )- (x -y-z) +(x+y-z ) -(x+y+z)
to ko danh dau de bai nhe giai ho tto