Известно,что 3х^3y = 4.Найдите: 1)21x^3 y,    2) 25х^6 y,   3)-6x^-3 y^-1, 4)8x^-9 y^-3,   5)-2/7x^6 y^2,   6)5x^-6 y^-2 СРОЧНО ПЖ ПОМОГИТЕ
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