化简(1) 2(x-8)(x+5)-(2x-1)(x+2) (2) (3m+1)(2m-3)-(6m-5)(m-4)
5个回答
=2x^2-6x-80-2x^2-3x+2
=-9x-78
=6m^2-7m-3-6m^2+29m+20
=22m+17
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