已知A=a²-ab+2b²,B=2a²+3ab-b²,求A-B的值
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![已知A=a²-ab+2b²,B=2a²+3ab-b²,求A-B的值](/uploads/image/z/1268162-26-2.jpg?t=%E5%B7%B2%E7%9F%A5A%3Da%26%23178%3B-ab%2B2b%26%23178%3B%2CB%3D2a%26%23178%3B%2B3ab-b%26%23178%3B%2C%E6%B1%82A-B%E7%9A%84%E5%80%BC)
已知A=a²-ab+2b²,B=2a²+3ab-b²,求A-B的值
已知A=a²-ab+2b²,B=2a²+3ab-b²,求A-B的值
已知A=a²-ab+2b²,B=2a²+3ab-b²,求A-B的值
解
A-B
=(a²-ab+2b²)-(2a²+3ab-b²)
=(a²-2a²)+(-ab-3ab)+(2b²+b²)
=-a²-4ab+3b²