a) = abc - abc + xyz - xyz - abc = -abc b) = s²t - st² - s²t - st² - s²t = -s²t c) = x²yz - xy²z - xyz² - x²yz - xy²z = -xyz² ;))
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) x² yz - (xy² z - (xyz² - ( x²yz - xy²z ))) =x² yz - (xy² z - (xyz² - x²yz + xy²z ))= =x² yz - (xy² z - xyz² + x²yz - xy²z )= =x² yz - xy² z + xyz² - x²yz + xy²z = =xyz²
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) x² yz - (xy² z - (xyz² - ( x²yz - xy²z )))=x²yz-(xy²z-(xyz²-x²yz+xy²z))=x²yz-(xy²z-x²yz+x²yz-xy²z)= =x²yz-xy²z+x²yz-x²yz+xy²z=x²yz
