先去括号,在合并同类项.(2m-1)+m-2(3m-2); 3(4x-2y)-3(-y+8x).

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先去括号,在合并同类项.(2m-1)+m-2(3m-2); 3(4x-2y)-3(-y+8x).
先去括号,在合并同类项.(2m-1)+m-2(3m-2); 3(4x-2y)-3(-y+8x).

先去括号,在合并同类项.(2m-1)+m-2(3m-2); 3(4x-2y)-3(-y+8x).
(2m-1)+m-2(3m-2)
=2m-1+m-6m+4
=-3m+3
3(4x-2y)-3(-y+8x).
=12x-6y+3y-24x
=-12x-3y
如果本题有什么不明白可以追问,
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(2m-1)+m-2(3m-2)
=2m-1+m-6m+4
=(2m+m-6m)+(4-1)
=-3m+3

3(4x-2y)-3(-y+8x)
=12x-6y+3y-24x
=(12x-24x)+(3y-6y)
=-12x-3y

(2m-1)+m-2(3m-2)
=2m-1+m-6m+4
=-3m+3

3(4x-2y)-3(-y+8x)
=12x-6y+3y-24x
=-12x-3y