问题标题:
5abc-7x^2+1-2x/521又1/34x-y/2哪些是单项式?5abc-7x^2+1-2x/521又1/34x-y/2
问题描述:

5abc-7x^2+1-2x/521又1/34x-y/2哪些是单项式?

5abc

-7x^2+1

-2x/5

21又1/3

4x-y/2

才洪全回答:
  21又1/34x-y/2
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