(3a+b)(a-2b) (x+5)(x-1) (1/2x+2)(4x-1/2) (0.1m-0.2n)(0.3m+0.4n) (x^2+xy+y^2)(x-y)
问题描述：
(3a+b)(a-2b) (x+5)(x-1) (1/2x+2)(4x-1/2) (0.1m-0.2n)(0.3m+0.4n) (x^2+xy+y^2)(x-y)
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(3a+b)(a-2b) (x+5)(x-1) (1/2x+2)(4x-1/2) (0.1m-0.2n)(0.3m+0.4n) (x^2+xy+y^2)(x-y)