求比3+a²-4a²少5a-8a+3a²的整式求比3+a²-4a少5a-8+3a²的整式 2.已知x+y=5,xy=1.求(3x-4y+2xy)-(2x-5y)-5xy的值
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![求比3+a²-4a²少5a-8a+3a²的整式求比3+a²-4a少5a-8+3a²的整式 2.已知x+y=5,xy=1.求(3x-4y+2xy)-(2x-5y)-5xy的值](/uploads/image/z/388220-68-0.jpg?t=%E6%B1%82%E6%AF%943%2Ba%26%23178%3B-4a%26%23178%3B%E5%B0%915a-8a%2B3a%26%23178%3B%E7%9A%84%E6%95%B4%E5%BC%8F%E6%B1%82%E6%AF%943%2Ba%26%23178%3B-4a%E5%B0%915a-8%2B3a%26%23178%3B%E7%9A%84%E6%95%B4%E5%BC%8F+2.%E5%B7%B2%E7%9F%A5x%2By%3D5%2Cxy%3D1.%E6%B1%82%EF%BC%883x-4y%2B2xy%29-%282x-5y%29-5xy%E7%9A%84%E5%80%BC)
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求比3+a²-4a²少5a-8a+3a²的整式求比3+a²-4a少5a-8+3a²的整式 2.已知x+y=5,xy=1.求(3x-4y+2xy)-(2x-5y)-5xy的值
求比3+a²-4a²少5a-8a+3a²的整式
求比3+a²-4a少5a-8+3a²的整式 2.已知x+y=5,xy=1.求(3x-4y+2xy)-(2x-5y)-5xy的值
求比3+a²-4a²少5a-8a+3a²的整式求比3+a²-4a少5a-8+3a²的整式 2.已知x+y=5,xy=1.求(3x-4y+2xy)-(2x-5y)-5xy的值
1、(3+a²-4a)-(5a-8+3a²)=-5-2a²-9a
2、(3x-4y+2xy)-(2x-5y)-5xy=3x-4y+2xy-2x+5y-5xy
=x-3xy+y
=x+y-3xy
=5-3
=2