若A=x³-3x²y+2xy²+3y³,B=x³-2x²y+xy²-5y³则2x³-7x²y+5xy²+14y³等于( )A、A-B B、A+2B C、A+B D、3A-B
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![若A=x³-3x²y+2xy²+3y³,B=x³-2x²y+xy²-5y³则2x³-7x²y+5xy²+14y³等于( )A、A-B B、A+2B C、A+B D、3A-B](/uploads/image/z/991411-43-1.jpg?t=%E8%8B%A5A%3Dx%26%23179%3B-3x%26%23178%3By%2B2xy%26%23178%3B%2B3y%26%23179%3B%2CB%3Dx%26%23179%3B-2x%26%23178%3By%2Bxy%26%23178%3B-5y%26%23179%3B%E5%88%992x%26%23179%3B-7x%26%23178%3By%2B5xy%26%23178%3B%2B14y%26%23179%3B%E7%AD%89%E4%BA%8E%EF%BC%88+%EF%BC%89A%E3%80%81A-B+B%E3%80%81A%2B2B+C%E3%80%81A%2BB+D%E3%80%813A-B)
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