若x+y=5,xy=6,求x²y+xy²的值(1)若x+y=5,xy=6,求x²y+xy²的值 (2)计算3x²·2xy·xy²·3xy (3)计算-2(x-2y)³[-1/3﹙2y-x³﹚]
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![若x+y=5,xy=6,求x²y+xy²的值(1)若x+y=5,xy=6,求x²y+xy²的值 (2)计算3x²·2xy·xy²·3xy (3)计算-2(x-2y)³[-1/3﹙2y-x³﹚]](/uploads/image/z/3910914-18-4.jpg?t=%E8%8B%A5x%2By%3D5%2Cxy%3D6%2C%E6%B1%82x%26%23178%3By%2Bxy%26%23178%3B%E7%9A%84%E5%80%BC%EF%BC%881%EF%BC%89%E8%8B%A5x%2By%3D5%EF%BC%8Cxy%3D6%EF%BC%8C%E6%B1%82x%26%23178%3By%2Bxy%26%23178%3B%E7%9A%84%E5%80%BC+%EF%BC%882%EF%BC%89%E8%AE%A1%E7%AE%973x%26%23178%3B%C2%B72xy%C2%B7xy%26%23178%3B%C2%B73xy+%EF%BC%883%EF%BC%89%E8%AE%A1%E7%AE%97-2%EF%BC%88x-2y%EF%BC%89%26%23179%3B%5B-1%EF%BC%8F3%EF%B9%992y-x%26%23179%3B%EF%B9%9A%5D)
若x+y=5,xy=6,求x²y+xy²的值(1)若x+y=5,xy=6,求x²y+xy²的值 (2)计算3x²·2xy·xy²·3xy (3)计算-2(x-2y)³[-1/3﹙2y-x³﹚]
若x+y=5,xy=6,求x²y+xy²的值
(1)若x+y=5,xy=6,求x²y+xy²的值
(2)计算3x²·2xy·xy²·3xy
(3)计算-2(x-2y)³[-1/3﹙2y-x³﹚]
若x+y=5,xy=6,求x²y+xy²的值(1)若x+y=5,xy=6,求x²y+xy²的值 (2)计算3x²·2xy·xy²·3xy (3)计算-2(x-2y)³[-1/3﹙2y-x³﹚]
第一题较简单可以直接得出等于30
第二题第三题可以用简单的方法算.x+y=5,xy=6,得出x+6/x=5,x2+6-5x=0 (x-2)(x-3)=0.得出x=2时y=3.x=3时y=2,代入即可
两式相乘即可,结果为30
(1)x²y+xy²=xy(x+y)=6*5=30
30