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2010-03-10T09:39:06+01:00
A)abc-(abc-(-xyz-(xyz-abc))) =
= abc-(abc-(-xyz -xyz+abc))=
=abc-(abc +xyz +xyz-abc) =
= abc-abc -xyz -xyz +abc=
-2xyz + abc

b)s²t-(st²-(s²t-(st²-s²t))) =
= s²t-(st²-(s²t-st²+s²t)) =
= s²t-(st²-s²t +st²-s²t) =
= s²t-st² +s²t -st²+s²t =
= 3s²t - 2st²

c) x²yz-(xy²z-(xyz²-(x²yz-xy²z)))=
= x²yz-(xy²z-(xyz²-x²yz+xy²z))=
= x²yz-(xy²z-xyz²+x²yz-xy²z)=
= x²yz-xy²z +xyz²-x²yz+xy²z=
= xyz²
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