金牌教练同步练习 新课标已知x³+y³=-19,x²y-xy²=-30,试请求代数式(x³-y³)-(x²y-3xy²)-2(x²y-y³)的值.
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![金牌教练同步练习 新课标已知x³+y³=-19,x²y-xy²=-30,试请求代数式(x³-y³)-(x²y-3xy²)-2(x²y-y³)的值.](/uploads/image/z/10428288-24-8.jpg?t=%E9%87%91%E7%89%8C%E6%95%99%E7%BB%83%E5%90%8C%E6%AD%A5%E7%BB%83%E4%B9%A0+%E6%96%B0%E8%AF%BE%E6%A0%87%E5%B7%B2%E7%9F%A5x%26%23179%3B%2By%26%23179%3B%3D-19%2Cx%26%23178%3By-xy%26%23178%3B%3D-30%2C%E8%AF%95%E8%AF%B7%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%88x%26%23179%3B-y%26%23179%3B%EF%BC%89-%EF%BC%88x%26%23178%3By-3xy%26%23178%3B%EF%BC%89-2%EF%BC%88x%26%23178%3By-y%26%23179%3B%EF%BC%89%E7%9A%84%E5%80%BC.)
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金牌教练同步练习 新课标已知x³+y³=-19,x²y-xy²=-30,试请求代数式(x³-y³)-(x²y-3xy²)-2(x²y-y³)的值.
金牌教练同步练习 新课标
已知x³+y³=-19,x²y-xy²=-30,试请求代数式(x³-y³)-(x²y-3xy²)-2(x²y-y³)的值.
金牌教练同步练习 新课标已知x³+y³=-19,x²y-xy²=-30,试请求代数式(x³-y³)-(x²y-3xy²)-2(x²y-y³)的值.
(x³-y³)-(x²y-3xy²)-2(x²y-y³)
=x³-y³-x²y+3xy²-2x²y+2y³
=x³+y³-3x²y+3xy²
=(x³+y³)-3(x²y-xy²)
=-19-3(-30)
=71