3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜计算
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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