(4x²-3x²)-2(x²+2x-1)-(x²+x-1) 其中x=-3-3(三分之一n-mn)+2(mn-½m)其中 m+n=-3 mn=22(a+1)-a若m,n互为相反数,则(5m-3n)-(2m-6m)+3 当x=1时 2ax²的值为3 当x=2时 ax²+bx
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![(4x²-3x²)-2(x²+2x-1)-(x²+x-1) 其中x=-3-3(三分之一n-mn)+2(mn-½m)其中 m+n=-3 mn=22(a+1)-a若m,n互为相反数,则(5m-3n)-(2m-6m)+3 当x=1时 2ax²的值为3 当x=2时 ax²+bx](/uploads/image/z/6923263-31-3.jpg?t=%EF%BC%884x%26%23178%3B-3x%26%23178%3B%EF%BC%89-2%EF%BC%88x%26%23178%3B%2B2x-1%EF%BC%89-%EF%BC%88x%26%23178%3B%2Bx-1%EF%BC%89+%E5%85%B6%E4%B8%ADx%3D-3-3%EF%BC%88%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80n-mn%EF%BC%89%2B2%EF%BC%88mn-%26%23189%3Bm%EF%BC%89%E5%85%B6%E4%B8%AD+m%2Bn%3D-3+mn%3D22%EF%BC%88a%EF%BC%8B1%EF%BC%89-a%E8%8B%A5m%2Cn%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E5%88%99%EF%BC%885m-3n%EF%BC%89-%EF%BC%882m-6m%EF%BC%89%2B3+%E5%BD%93x%3D1%E6%97%B6+2ax%26%23178%3B%E7%9A%84%E5%80%BC%E4%B8%BA3+%E5%BD%93x%3D2%E6%97%B6+ax%26%23178%3B%2Bbx)
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