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