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题型:单选题 题类:常考题 难易度:普通
①3a+2b=5ab;②3a+b=3ab;③3a﹣a=3;④2R+πR=(2+π)R;
⑤7ab﹣7ba=0;⑥4x2y3﹣5x2y3=﹣x2y3;⑦﹣2﹣3=﹣5;⑧3x2+2x3=5x5 .
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