1.已知a²+b²=5,ab=2,求2a²-3ab-b²-a²+ab+2b²的值,若把已知条件改为(ab-2)²+|a²+b²-5|=0,能求出上式的值吗?2.若代数式二分之一x²y³-3x的m次方y的m-1次方+xy²是一
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![1.已知a²+b²=5,ab=2,求2a²-3ab-b²-a²+ab+2b²的值,若把已知条件改为(ab-2)²+|a²+b²-5|=0,能求出上式的值吗?2.若代数式二分之一x²y³-3x的m次方y的m-1次方+xy²是一](/uploads/image/z/10334197-37-7.jpg?t=1.%E5%B7%B2%E7%9F%A5a%26%23178%3B%2Bb%26%23178%3B%3D5%2Cab%3D2%2C%E6%B1%822a%26%23178%3B-3ab-b%26%23178%3B-a%26%23178%3B%2Bab%2B2b%26%23178%3B%E7%9A%84%E5%80%BC%2C%E8%8B%A5%E6%8A%8A%E5%B7%B2%E7%9F%A5%E6%9D%A1%E4%BB%B6%E6%94%B9%E4%B8%BA%EF%BC%88ab-2%EF%BC%89%26%23178%3B%2B%7Ca%26%23178%3B%2Bb%26%23178%3B-5%7C%3D0%2C%E8%83%BD%E6%B1%82%E5%87%BA%E4%B8%8A%E5%BC%8F%E7%9A%84%E5%80%BC%E5%90%97%3F2.%E8%8B%A5%E4%BB%A3%E6%95%B0%E5%BC%8F%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80x%26%23178%3By%26%23179%3B-3x%E7%9A%84m%E6%AC%A1%E6%96%B9y%E7%9A%84m-1%E6%AC%A1%E6%96%B9%2Bxy%26%23178%3B%E6%98%AF%E4%B8%80)
1.已知a²+b²=5,ab=2,求2a²-3ab-b²-a²+ab+2b²的值,若把已知条件改为(ab-2)²+|a²+b²-5|=0,能求出上式的值吗?2.若代数式二分之一x²y³-3x的m次方y的m-1次方+xy²是一
1.已知a²+b²=5,ab=2,求2a²-3ab-b²-a²+ab+2b²的值,若把已知条件改为(ab-2)²+|a²+b²-5|=0,能求出上式的值吗?
2.若代数式二分之一x²y³-3x的m次方y的m-1次方+xy²是一个二项式,求代数式(m-n)²+2mn-2(m-n)²的值
1.已知a²+b²=5,ab=2,求2a²-3ab-b²-a²+ab+2b²的值,若把已知条件改为(ab-2)²+|a²+b²-5|=0,能求出上式的值吗?2.若代数式二分之一x²y³-3x的m次方y的m-1次方+xy²是一
1.2a²-3ab-b²-a²+ab+2b²=a²-2ab+b²=a²+b²-2ab=5-4=1
把已知条件改为(ab-2)²+|a²+b²-5|=0
则有ab-2=0 a²+b²-5=0
可得a²+b²=5,ab=2
2.题目有点问题