3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜计算
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![3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜计算](/uploads/image/z/469436-68-6.jpg?t=3x%26%23178%3By%EF%BC%8D%EF%B9%9Bxy%EF%BC%8D%5B3xy%EF%BC%8D%EF%BC%884xy%26%23178%3B%2B%26%23189%3Bxy%EF%BC%89%5D%EF%BC%8D4x%26%23178%3By%EF%B9%9C%E8%AE%A1%E7%AE%97)
3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜计算
3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜
计算
3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜计算
3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜
=3x²y-{xy-[3xy-4xy²-½xy]-4x²y﹜
=3x²y-{xy-3xy+4xy²+½xy-4x²y﹜
=3x²y-xy+3xy-4xy²-½xy+4x²y
=7x^2y-4xy^2+3/2xy