作业帮若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q）],是2P还是2P-2Q?
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/05 12:47:24
![若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q）],是2P还是2P-2Q?](/uploads/image/z/1104641-17-1.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%EF%BC%89%5D%2C%E6%98%AF2P%E8%BF%98%E6%98%AF2P-2Q%3F)
若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q）],是2P还是2P-2Q?
若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q）],是2P还是2P-2Q?
若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-（-P-Q）],是2P还是2P-2Q?
解P-[Q-2P-（-P-Q）],
=p-（Q-2p+p+Q)
=P-Q+2p-p-Q
=2p-2Q
=2(p-Q)=2[(a²+3ab+b²）-（a²-3ab+b²）]
=2×（6ab）
=12ab