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duchieu456
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
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![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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