几道数学题..关于十字相乘法的.求解..最好写出过程..1.(x+y)²-4(x+y)+82.(x+y)²+3(x+y)-283. x²y²-5xy+44. x²y²+6xy+85. x的三次方+5x²+6x
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![几道数学题..关于十字相乘法的.求解..最好写出过程..1.(x+y)²-4(x+y)+82.(x+y)²+3(x+y)-283. x²y²-5xy+44. x²y²+6xy+85. x的三次方+5x²+6x](/uploads/image/z/7253855-71-5.jpg?t=%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98..%E5%85%B3%E4%BA%8E%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E7%9A%84.%E6%B1%82%E8%A7%A3..%E6%9C%80%E5%A5%BD%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B..1.%EF%BC%88x%2By%29%26%23178%3B-4%EF%BC%88x%2By%EF%BC%89%2B82.%EF%BC%88x%2By%EF%BC%89%26%23178%3B%2B3%EF%BC%88x%2By%EF%BC%89-283.++x%26%23178%3By%26%23178%3B-5xy%2B44.++x%26%23178%3By%26%23178%3B%2B6xy%2B85.++x%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B5x%26%23178%3B%2B6x)
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