一位同学做一道题:“已知两个多项式A、B,计算A-B”.他误将“A-B”看成“A 发布时间:2017-05-21 13:32 │ 来源:www.tikuol.com 题型:解答题 问题: 一位同学做一道题:“已知两个多项式A、B,计算A-B”.他误将“A-B”看成“A+B”,求得的结果为5x2-2x+4.已知B=2x2-3x+7,求A-B的正确答案.
题型:解答题 Excuse me, can you tell me_____?[ ]A. why was the train .late B. why the train was lateC. why is the train late D. why the train is late 查看答案