作业帮若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q)]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/04 19:26:16
![若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q)]](/uploads/image/z/1785942-54-2.jpg?t=%E8%8B%A5P%3Da%26%23178%3B%2B3ab%2Bb%26%23178%3B%2CQ%3Da%26%23178%3B-3ab%2Bb%26%23178%3B%2C%E5%8C%96%E7%AE%80P-%5BQ-2P-%EF%BC%88-P-Q%29%5D)
若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q)]
若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q)]
若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q)]
P-[Q-2P+P+Q]
=P-[2Q-P]
=P-2Q+P
=2P-2Q=2(P-Q) 将P=a²+3ab+b²,Q=a²-3ab+b²,带入可得结果为：12ab