化简 18m-5n-[20m-(3n-6)]-2(2m+n+3) 2x-{-3y+[4x-(3x-y)]}(1) 18m-5n-[20m-(3n-6)]-2(2m+n+3) (2) 2x-{-3y+[4x-(3x-y)]}

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化简18m-5n-[20m-(3n-6)]-2(2m+n+3)2x-{-3y+[4x-(3x-y)]}(1)18m-5n-[20m-(3n-6)]-2(2m+n+3)(2)2x-{-3y+[4x-(3

化简 18m-5n-[20m-(3n-6)]-2(2m+n+3) 2x-{-3y+[4x-(3x-y)]}(1) 18m-5n-[20m-(3n-6)]-2(2m+n+3) (2) 2x-{-3y+[4x-(3x-y)]}
化简 18m-5n-[20m-(3n-6)]-2(2m+n+3) 2x-{-3y+[4x-(3x-y)]}
(1) 18m-5n-[20m-(3n-6)]-2(2m+n+3) (2) 2x-{-3y+[4x-(3x-y)]}

化简 18m-5n-[20m-(3n-6)]-2(2m+n+3) 2x-{-3y+[4x-(3x-y)]}(1) 18m-5n-[20m-(3n-6)]-2(2m+n+3) (2) 2x-{-3y+[4x-(3x-y)]}
1 -6m-4n-12
2 x+2y