Toán nâng cao 8

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kimanh1501.hy@gmail.com

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manhnguyen0164

a. yz(y+z)+xz(z−x)−xy(x+y)=yz(y+z)+xz[(y+z)−(x+y)]−xy(x+y)yz(y+z)+xz(z-x)- xy(x+y)=yz(y+z)+xz[(y+z)-(x+y)]-xy(x+y)

=(y+z)(yz+xz)−(x+y)(xz+xy)=z(x+y)(y+z)−x(x+y)(y+z)=(x+y)(y+z)(z−x)=(y+z)(yz+xz)-(x+y)(xz+xy)=z(x+y)(y+z)-x(x+y)(y+z)=(x+y)(y+z)(z-x)
 
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