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合并同类项(1)3b^2-(a^2+b^2)-b^2(2)x+(2x-1)-(x/3 +3)(3)-2(ab-3a^2)+(5ab-a^2)(4)2a^2- 1/2 (ab+a^2)-8ab(5)-(b-4)+4(-b-3)(6)1/2 (x^2-y)+1/3 (x-y^2)+1/6 (x^2+y^2)
题目内容：
合并同类项
(1)3b^2-(a^2+b^2)-b^2
(2)x+(2x-1)-(x/3 +3)
(3)-2(ab-3a^2)+(5ab-a^2)
(4)2a^2- 1/2 (ab+a^2)-8ab
(5)-(b-4)+4(-b-3)
(6)1/2 (x^2-y)+1/3 (x-y^2)+1/6 (x^2+y^2)
合并同类项
(1)3b^2-(a^2+b^2)-b^2
(2)x+(2x-1)-(x/3 +3)
(3)-2(ab-3a^2)+(5ab-a^2)
(4)2a^2- 1/2 (ab+a^2)-8ab
(5)-(b-4)+4(-b-3)
(6)1/2 (x^2-y)+1/3 (x-y^2)+1/6 (x^2+y^2)
(1)3b^2-(a^2+b^2)-b^2
(2)x+(2x-1)-(x/3 +3)
(3)-2(ab-3a^2)+(5ab-a^2)
(4)2a^2- 1/2 (ab+a^2)-8ab
(5)-(b-4)+4(-b-3)
(6)1/2 (x^2-y)+1/3 (x-y^2)+1/6 (x^2+y^2)
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