一个多项式加上ab-3b²等于b²-2ab+a²,则这个多项式为( )A.4b²-3ab+a² B.-4b²+3ab-a² C.4b²+3ab-a² D.a²-4b²-3ab
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 00:07:49
![一个多项式加上ab-3b²等于b²-2ab+a²,则这个多项式为( )A.4b²-3ab+a² B.-4b²+3ab-a² C.4b²+3ab-a² D.a²-4b²-3ab](/uploads/image/z/10174915-19-5.jpg?t=%E4%B8%80%E4%B8%AA%E5%A4%9A%E9%A1%B9%E5%BC%8F%E5%8A%A0%E4%B8%8Aab-3b%26%23178%3B%E7%AD%89%E4%BA%8Eb%26%23178%3B-2ab%2Ba%26%23178%3B%2C%E5%88%99%E8%BF%99%E4%B8%AA%E5%A4%9A%E9%A1%B9%E5%BC%8F%E4%B8%BA%EF%BC%88+%EF%BC%89A.4b%26%23178%3B-3ab%2Ba%26%23178%3B+B.-4b%26%23178%3B%2B3ab-a%26%23178%3B+C.4b%26%23178%3B%2B3ab-a%26%23178%3B+D.a%26%23178%3B-4b%26%23178%3B-3ab)
一个多项式加上ab-3b²等于b²-2ab+a²,则这个多项式为( )A.4b²-3ab+a² B.-4b²+3ab-a² C.4b²+3ab-a² D.a²-4b²-3ab
一个多项式加上ab-3b²等于b²-2ab+a²,则这个多项式为( )
A.4b²-3ab+a² B.-4b²+3ab-a² C.4b²+3ab-a² D.a²-4b²-3ab
一个多项式加上ab-3b²等于b²-2ab+a²,则这个多项式为( )A.4b²-3ab+a² B.-4b²+3ab-a² C.4b²+3ab-a² D.a²-4b²-3ab
一个多项式加上ab-3b²等于b²-2ab+a²,则这个多项式为( 4b²-3ab+a² )
这个多项式为(A)
选A的嘛
(b²-2ab+a²)-(ab-3b²)
=b²-2ab+a²-ab+3b²
=(b²+3b²)+(-2ab-ab)+a²
=4b²-3ab+a²
答案:(A)