来人帮个忙,解决下,没分,1.2x²y^3×(x²y^3)²×(-x²y^3)^3= 2.若(x+a)与(x+b)的积不含常数项,则有 3.若(x+my)与(x-ny)的积不含xy项,则m、n的关系为4.先化简,再求值:(x+1)(
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![来人帮个忙,解决下,没分,1.2x²y^3×(x²y^3)²×(-x²y^3)^3= 2.若(x+a)与(x+b)的积不含常数项,则有 3.若(x+my)与(x-ny)的积不含xy项,则m、n的关系为4.先化简,再求值:(x+1)(](/uploads/image/z/8752570-34-0.jpg?t=%E6%9D%A5%E4%BA%BA%E5%B8%AE%E4%B8%AA%E5%BF%99%2C%E8%A7%A3%E5%86%B3%E4%B8%8B%2C%E6%B2%A1%E5%88%86%2C1.2x%26%23178%3By%5E3%C3%97%EF%BC%88x%26%23178%3By%5E3%EF%BC%89%26%23178%3B%C3%97%EF%BC%88-x%26%23178%3By%5E3%EF%BC%89%5E3%3D+2.%E8%8B%A5%EF%BC%88x%2Ba%EF%BC%89%E4%B8%8E%EF%BC%88x%2Bb%EF%BC%89%E7%9A%84%E7%A7%AF%E4%B8%8D%E5%90%AB%E5%B8%B8%E6%95%B0%E9%A1%B9%2C%E5%88%99%E6%9C%89+3.%E8%8B%A5%EF%BC%88x%2Bmy%EF%BC%89%E4%B8%8E%EF%BC%88x-ny%EF%BC%89%E7%9A%84%E7%A7%AF%E4%B8%8D%E5%90%ABxy%E9%A1%B9%2C%E5%88%99m%E3%80%81n%E7%9A%84%E5%85%B3%E7%B3%BB%E4%B8%BA4.%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88x%2B1%EF%BC%89%EF%BC%88)
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