Ответ:
(у-7х^4)-(2,3-9х^4)=у-7х^4-2,3+9х^4=у+2х^4-2,3
(39n^2-2m)+(5m-44n^2)=39n^2-2m+5m-44n^2=-5n^2+3m
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Ответ:
(у-7х^4)-(2,3-9х^4)=у-7х^4-2,3+9х^4=у+2х^4-2,3
(39n^2-2m)+(5m-44n^2)=39n^2-2m+5m-44n^2=-5n^2+3m