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2010-03-23T19:48:23+01:00
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a) abc - (abc- (-xyz-abc))) = abc-(abc-(-xyz-xyz+abc)) = abc- (abc+xyz+xyz-abc)=abc-2xyz
b) s²t-(st²-(s²t-(st² - s²t))) = s²t - (st²-(s²t- st²+s²t))= s²t - (st²-s²t+st²-s²t)= s²t-st²+s²t-st²+s²t= 3s²t-2st²
c)x² - yz - (xy²z - ( x²yz-xy²z))) = x²yz-(xy²z - (xyz²- x²yz + xy²z)) = x²yz - (xy²z-xyz²+x²yz+xy²z) = x²yz-xy²z + xyz² - x²yz + xy²z = xyz²

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