整式单元1.先化简,再求值(2x-3y-2xy) - (x-4y+7xy)其中x+y=5.xy= -32.已知A=a²+b²-c²,B= -4a²+2b²+3c²,并且A+B+C=0,则C是什么样的多项式?3.已知(x+2)²+丨3y-2丨=0求½x-2(x-三分之一
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![整式单元1.先化简,再求值(2x-3y-2xy) - (x-4y+7xy)其中x+y=5.xy= -32.已知A=a²+b²-c²,B= -4a²+2b²+3c²,并且A+B+C=0,则C是什么样的多项式?3.已知(x+2)²+丨3y-2丨=0求½x-2(x-三分之一](/uploads/image/z/11492750-38-0.jpg?t=%E6%95%B4%E5%BC%8F%E5%8D%95%E5%85%831.%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%882x-3y-2xy%29+-+%28x-4y%2B7xy%29%E5%85%B6%E4%B8%ADx%2By%3D5.xy%3D+-32.%E5%B7%B2%E7%9F%A5A%3Da%26%23178%3B%2Bb%26%23178%3B-c%26%23178%3B%2CB%3D+-4a%26%23178%3B%2B2b%26%23178%3B%2B3c%26%23178%3B%2C%E5%B9%B6%E4%B8%94A%2BB%2BC%3D0%2C%E5%88%99C%E6%98%AF%E4%BB%80%E4%B9%88%E6%A0%B7%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8F%3F3.%E5%B7%B2%E7%9F%A5%EF%BC%88x%2B2%EF%BC%89%26%23178%3B%2B%E4%B8%A83y-2%E4%B8%A8%3D0%E6%B1%82%26%23189%3Bx-2%EF%BC%88x-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80)
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