Question

а)2ab-3ba+5a-a; б)abc+bca+cab; в)xy-x=y-yx; г)xyz-yzx-xzy-zxy.

Answer 1

a)2ab-3ba+5a-a=-ba+4a=a(-b+4)=-ab+4a

б)abc+bca+cab=3abc 

в)xy-x=y-yx

   x(y-1)=y(1-x)

г)xyz-yzx-xzy-zxy=-2xyz