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                本文最初寫于 2010-07-26于 sohu 博客,這次博客搬家一起搬到這里來。 版權所有,轉載請注明出處。 maxima有很多操縱代數表達式的函數,這里只列出了部分常用的。其他的我還沒用過。 ? ratsimp(expr);??? /* Simplify expression */ fullratsimp(expr)?? /* fully Simplify expression */ radcan(expr);???? /* Simplify radicals(包含對數、指數、根式) */ factor(expr);???? /* Factor expression (因式分解)*/ factor (expr, p) gfactor(expr);??? /* Factor complex (將成對的復數根也因式分解開)*/ expand(expr);???? /* Expand expression(表達式展開) */ expand (expr, p, n); expr,logexpan=super;??? /* Expand logarithms (展開對數表達式)*/ logcontract(expr);?????? /* Contract logarithms */ ? ? 一些例子: 1 ratsimp sin (x/(x^2 + x)) = exp ((log(x) + 1)^2 - log(x)^2); ratsimp (%); ![](https://box.kancloud.cn/2016-01-24_56a4233d2ef36.PNG) ? expr: (x^(a/2) + 1)^2*(x^(a/2) - 1)^2/(x^a - 1); ratsimp (expr); fullratsimp (expr); ![](https://box.kancloud.cn/2016-01-24_56a4233d3bade.PNG) 2 radcan radcan((log(x+x^2)-log(x))^a/log(1+x)^(a/2)); radcan((%e^x-1)/(1+%e^(x/2))); ![](https://box.kancloud.cn/2016-01-24_56a4233d491fb.PNG) 3 factor factor (2^63 - 1); factor (-8*y - 4*x + z^2*(2*y + x)); factor (1 + x^4, a^2 - 2); gfactor (x^4 - 1); ![](https://box.kancloud.cn/2016-01-24_56a4233d56f94.PNG) ? 4 expand expr:(x+1)^2*(y+1)^3; expand(expr); expr:(x+1)^-2*(y+1)^3; expand(expr,2,2); ![](https://box.kancloud.cn/2016-01-24_56a4233d62cfc.PNG) 5 logcontract 2*(a*log(x) + 2*a*log(y))$ logcontract(%); ![](https://box.kancloud.cn/2016-01-24_56a4233d6e54e.PNG)
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