2x . 4x = - 8x2, 3x4 . 2x2 = - 6x4, -1/2 a3 . 4a = - -2a4, b4 . b2 . 2b = - 2b7, 3a2 . 2b3 . 2ba = - 12 a3 b4, 10x4 : 5x = - 2x3, -21a2b4 : 7 ab2 = - -3ab2, 1/2 x5 : 1/4 x4 = - 2x, -12a5b4 : 6a5b4 - -2,

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