初中的计算题x²-2(x²-xy+y²)+(-x²+3xy+2y²)
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初中的计算题
x²-2(x²-xy+y²)+(-x²+3xy+2y²)
x²-2(x²-xy+y²)+(-x²+3xy+2y²)
![初中的计算题x²-2(x²-xy+y²)+(-x²+3xy+2y²)](/uploads/image/z/17729514-18-4.jpg?t=%E5%88%9D%E4%B8%AD%E7%9A%84%E8%AE%A1%E7%AE%97%E9%A2%98x%26%23178%3B-2%EF%BC%88x%26%23178%3B-xy%2By%26%23178%3B%EF%BC%89%2B%EF%BC%88-x%26%23178%3B%2B3xy%2B2y%26%23178%3B%EF%BC%89)
原式=x²-2x²+2xy-2y²-x²+3xy+2y²=5xy-2x²
不谢,
不谢,
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