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单选题
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1.如果单项式-3xay2与x3yb是同类项,则这两个单项式的和是( )
A: 2x2y2
B: -2x3y2
C: -2x6y4
D: -3x3y2
  • 提示1IOaYjuehruWQjOexu+mhueeahOWumuS5ie+8jOKAnOWtl+avjeebuOWQjO+8jOebuOWQjOWtl+avjeeahOaMh+aVsOebuOWQjOKAne+8jOaxguWHumEsYu+8mw==
  • 提示2IOWvueWQjOexu+mhuei/m+ihjOWQiOW5tu+8mw==
  • 提示3IOazqOaEj+espuWPt+eahOWPmOWMlg==