若单项式1/3x^2y^m与-2x^n-1y^2的和仍然是一个单项式,和是多少?一题如上,下题求n^-m+(m-n)^2的值.如何求得,两题请明说.附加题:修改:The Eiffel Tower is in the USA.还有在三角形ABC中,角A=90°,角C=45°,DE
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![若单项式1/3x^2y^m与-2x^n-1y^2的和仍然是一个单项式,和是多少?一题如上,下题求n^-m+(m-n)^2的值.如何求得,两题请明说.附加题:修改:The Eiffel Tower is in the USA.还有在三角形ABC中,角A=90°,角C=45°,DE](/uploads/image/z/2770483-67-3.jpg?t=%E8%8B%A5%E5%8D%95%E9%A1%B9%E5%BC%8F1%2F3x%5E2y%5Em%E4%B8%8E-2x%5En-1y%5E2%E7%9A%84%E5%92%8C%E4%BB%8D%E7%84%B6%E6%98%AF%E4%B8%80%E4%B8%AA%E5%8D%95%E9%A1%B9%E5%BC%8F%2C%E5%92%8C%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E4%B8%80%E9%A2%98%E5%A6%82%E4%B8%8A%2C%E4%B8%8B%E9%A2%98%E6%B1%82n%5E-m%2B%EF%BC%88m-n%EF%BC%89%5E2%E7%9A%84%E5%80%BC.%E5%A6%82%E4%BD%95%E6%B1%82%E5%BE%97%2C%E4%B8%A4%E9%A2%98%E8%AF%B7%E6%98%8E%E8%AF%B4.%E9%99%84%E5%8A%A0%E9%A2%98%EF%BC%9A%E4%BF%AE%E6%94%B9%3AThe+Eiffel+Tower+is+in+the+USA.%E8%BF%98%E6%9C%89%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92A%3D90%C2%B0%2C%E8%A7%92C%3D45%C2%B0%2CDE)
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