(a+b)的立方-2(a+b)的立方-1/3(b+a)的立方-0.5(a+b)的立方=?合并同类项

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(a+b)的立方-2(a+b)的立方-1/3(b+a)的立方-0.5(a+b)的立方=?合并同类项
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(a+b)的立方-2(a+b)的立方-1/3(b+a)的立方-0.5(a+b)的立方=?合并同类项
(a+b)的立方-2(a+b)的立方-1/3(b+a)的立方-0.5(a+b)的立方=?合并同类项

(a+b)的立方-2(a+b)的立方-1/3(b+a)的立方-0.5(a+b)的立方=?合并同类项
(a+b)的立方-2(a+b)的立方-1/3(b+a)的立方-0.5(a+b)的立方
=(1-2-1/3-0.5)(a+b)的立方
=-2又1/3(a+b)的立方