Corretto: x2y, xy2, 6x2y, -xyz, 1/3abc, 12ab2, 4b3, -5bc2, 18abc, 2a2b, 3a2c, 3abc, 3x2z, 4xz2, 5xyz, -6x3, 10z3, 32x3, -4a3, 5b3, -1/2ac2, Errato: 3x3y, 7xy3, -3x3y2, -4abc3, -2a3bc, 1/b3, 2xy, 3ab, -ab3, b2c2, 32ab2c2, 1/3xy, 33xy, x/y2, 2abcd, -y3/x, 73xy, -4a3b3, a3+b3,

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