f(X+1)=x²+3x+1 求f(X)的解析式用 u代替 x+1.那么x 等于y-1.f(u)=(u-1)^2 + 3*(u-1) + 1;不明白为什么可以将u 换成 x 就有了 f(x)=(x-1)^2 + 3*(x-1) +1?;
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![f(X+1)=x²+3x+1 求f(X)的解析式用 u代替 x+1.那么x 等于y-1.f(u)=(u-1)^2 + 3*(u-1) + 1;不明白为什么可以将u 换成 x 就有了 f(x)=(x-1)^2 + 3*(x-1) +1?;](/uploads/image/z/1633059-27-9.jpg?t=f%EF%BC%88X%2B1%29%3Dx%26%23178%3B%2B3x%2B1+%E6%B1%82f%EF%BC%88X%29%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E7%94%A8+u%E4%BB%A3%E6%9B%BF+x%2B1.%E9%82%A3%E4%B9%88x+%E7%AD%89%E4%BA%8Ey-1.f%28u%29%3D%28u-1%29%5E2+%2B+3%2A%28u-1%29+%2B+1%3B%E4%B8%8D%E6%98%8E%E7%99%BD%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8F%AF%E4%BB%A5%E5%B0%86u+%E6%8D%A2%E6%88%90+x+%E5%B0%B1%E6%9C%89%E4%BA%86+f%28x%29%3D%28x-1%29%5E2+%2B+3%2A%28x-1%29+%2B1%3F%3B)
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