Ответ:
1).z^4-2z^2y+y^2
2)x^2/4-xy/3+y^2/9
3)1/16+n+4n^2
4)6,25a^4+20b^2
5)9a^2b^2-a^3b+1/36a^4
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Ответ:
1).z^4-2z^2y+y^2
2)x^2/4-xy/3+y^2/9
3)1/16+n+4n^2
4)6,25a^4+20b^2
5)9a^2b^2-a^3b+1/36a^4