把多项式2ab2﹣5a2b﹣7+a3b3按字母b的降幂排列，排在第三项的是_1．_刷题宝

题干

把多项式2ab²﹣5a²b﹣7+a³b³按字母b的降幂排列，排在第三项的是____．

上一题下一题 0.0难度选择题更新时间:2019-02-26 03:37:43

答案(点此获取答案解析）

﹣5a²b．

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