Ответ:
а)4-4х+х^2-(4+4х+х^2)+8х=4-4х+х^2-4-4х-х^2+8х=-8х+8х=0
b)16х^4+8х^2у+у^2+16у^2-8х^2у+х^4-17у^2=17х^4
с)1/4у^2-2ху+4х^2+3 (9у^2+2ху+1/9х^2)-4ху=1/4у^2-2ху+4х^2+27у^2+6ху+1/3х^2-4ху=27 1/4у^2+4 1/3 х^2
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Ответ:
а)4-4х+х^2-(4+4х+х^2)+8х=4-4х+х^2-4-4х-х^2+8х=-8х+8х=0
b)16х^4+8х^2у+у^2+16у^2-8х^2у+х^4-17у^2=17х^4
с)1/4у^2-2ху+4х^2+3 (9у^2+2ху+1/9х^2)-4ху=1/4у^2-2ху+4х^2+27у^2+6ху+1/3х^2-4ху=27 1/4у^2+4 1/3 х^2