1.试说明不论x,y取何值时,代数式(xxx+3xxxy-5xyy+6yyy+1)-(2xxx-yyy-2xyy-xxy-2)-(4xxy+7yyy-xxx-3xyy-1)的值是一个常数.2.无论x取何值,代数式-3xx+mx+nxx-x+3的值总是3,试求m,n的值.3.已知y=axxxxx+bxxx+cx-5,当x=-3,y=7,那
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![1.试说明不论x,y取何值时,代数式(xxx+3xxxy-5xyy+6yyy+1)-(2xxx-yyy-2xyy-xxy-2)-(4xxy+7yyy-xxx-3xyy-1)的值是一个常数.2.无论x取何值,代数式-3xx+mx+nxx-x+3的值总是3,试求m,n的值.3.已知y=axxxxx+bxxx+cx-5,当x=-3,y=7,那](/uploads/image/z/10795657-49-7.jpg?t=1.%E8%AF%95%E8%AF%B4%E6%98%8E%E4%B8%8D%E8%AE%BAx%2Cy%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%88xxx%2B3xxxy-5xyy%2B6yyy%2B1%29-%282xxx-yyy-2xyy-xxy-2%29-%284xxy%2B7yyy-xxx-3xyy-1%29%E7%9A%84%E5%80%BC%E6%98%AF%E4%B8%80%E4%B8%AA%E5%B8%B8%E6%95%B0.2.%E6%97%A0%E8%AE%BAx%E5%8F%96%E4%BD%95%E5%80%BC%2C%E4%BB%A3%E6%95%B0%E5%BC%8F-3xx%2Bmx%2Bnxx-x%2B3%E7%9A%84%E5%80%BC%E6%80%BB%E6%98%AF3%2C%E8%AF%95%E6%B1%82m%2Cn%E7%9A%84%E5%80%BC.3.%E5%B7%B2%E7%9F%A5y%3Daxxxxx%2Bbxxx%2Bcx-5%2C%E5%BD%93x%3D-3%2Cy%3D7%2C%E9%82%A3)
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