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![下列整式中那些是单项式?那些是多项式,它们的次数分别是多少﹙1﹚2x²-4x-1 ﹙2﹚-7a²bc ﹙3﹚﹣1/3a²b+2/3ab²-1/4a³+1/4b³ ﹙4﹚-1/6xy ﹙5﹚-1/6x-1/6y+1/3 ﹙6﹚pqr-p²r+q²r](/uploads/image/z/3755694-30-4.jpg?t=%E4%B8%8B%E5%88%97%E6%95%B4%E5%BC%8F%E4%B8%AD%E9%82%A3%E4%BA%9B%E6%98%AF%E5%8D%95%E9%A1%B9%E5%BC%8F%3F%E9%82%A3%E4%BA%9B%E6%98%AF%E5%A4%9A%E9%A1%B9%E5%BC%8F%2C%E5%AE%83%E4%BB%AC%E7%9A%84%E6%AC%A1%E6%95%B0%E5%88%86%E5%88%AB%E6%98%AF%E5%A4%9A%E5%B0%91%EF%B9%991%EF%B9%9A2x%26%23178%3B-4x-1+%EF%B9%992%EF%B9%9A-7a%26%23178%3Bbc+%EF%B9%993%EF%B9%9A%EF%B9%A31%2F3a%26%23178%3Bb%2B2%2F3ab%26%23178%3B-1%2F4a%26%23179%3B%2B1%2F4b%26%23179%3B+%EF%B9%994%EF%B9%9A-1%2F6xy+%EF%B9%995%EF%B9%9A-1%2F6x-1%2F6y%2B1%2F3+%EF%B9%996%EF%B9%9Apqr-p%26%23178%3Br%2Bq%26%23178%3Br)
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