计算2x²-5xy+6y²加多项式A时,误算成减去A,错误结果为7y²+4xy+4x²,
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![计算2x²-5xy+6y²加多项式A时,误算成减去A,错误结果为7y²+4xy+4x²,](/uploads/image/z/4335777-9-7.jpg?t=%E8%AE%A1%E7%AE%972x%26%23178%3B%EF%BC%8D5xy%2B6y%26%23178%3B%E5%8A%A0%E5%A4%9A%E9%A1%B9%E5%BC%8FA%E6%97%B6%2C%E8%AF%AF%E7%AE%97%E6%88%90%E5%87%8F%E5%8E%BBA%2C%E9%94%99%E8%AF%AF%E7%BB%93%E6%9E%9C%E4%B8%BA7y%26%23178%3B%2B4xy%2B4x%26%23178%3B%2C)
计算2x²-5xy+6y²加多项式A时,误算成减去A,错误结果为7y²+4xy+4x²,
计算2x²-5xy+6y²加多项式A时,误算成减去A,错误结果为7y²+4xy+4x²,
计算2x²-5xy+6y²加多项式A时,误算成减去A,错误结果为7y²+4xy+4x²,
2x²-5xy+6y²-A=7y²+4xy+4x²
所以2x²-5xy+6y²+A
=2(2x²-5xy+6y²)-(7y²+4xy+4x²)
=4x²-10xy+12y²-7y²-4xy-4x²
=-14xy+5y²