无
*注意事项:
5x+8x=
10m-m=
x-0.5x=
5n+7n=
2y-0.7y=
y×6×y=
(a+b)×8=
8-a×5=
n+1.8n=
7a+6a-10=
13.7b+3b=
11+3.6m-2m=
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