已知:A=2x²+4xy-2x-3,B=-x²+xy+2 求3A+6B
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![已知:A=2x²+4xy-2x-3,B=-x²+xy+2 求3A+6B](/uploads/image/z/3779895-39-5.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9AA%3D2x%26%23178%3B%2B4xy-2x-3%2CB%3D-x%26%23178%3B%2Bxy%2B2+%E6%B1%823A%2B6B)
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