若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-(-P-Q)]
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若P=a²+3ab+b²,Q=a²-3ab+b²,化简P-[Q-2P-(-P-Q)]若P=a²+3ab+b²,Q=a²-3ab+b
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