已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,重在已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,
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![已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,重在已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,](/uploads/image/z/3738384-0-4.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%3D3%2Cxy%3D-2%2C%E6%B1%82%EF%BC%883x-4y%2B2xy%EF%BC%89-%EF%BC%882x-5%2B5xy%EF%BC%89%E7%9A%84%E5%80%BC%2C%E9%87%8D%E5%9C%A8%E5%B7%B2%E7%9F%A5x%2By%3D3%2Cxy%3D-2%2C%E6%B1%82%EF%BC%883x-4y%2B2xy%EF%BC%89-%EF%BC%882x-5%2B5xy%EF%BC%89%E7%9A%84%E5%80%BC%2C)
已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,重在已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,
已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,重在
已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,
已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,重在已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,
(3x-4y+2xy)-(2x-5y+5xy)
=x+y-3xy
=3+3x2
=9
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