![解方程,一元一次,二元一次,一元二次,二元二次,一元三次](http://www.jisuanqiol.com/d/file/equation/2017-12-17/7b0128a0fe4ee057f847a0182693b6c2.png)
函数练习题 已知 f(X)=2X+5, g(X) =X-3 。试求:
(1) g(f(X)) (2) f(g(X))
详解:
(1) g(f(X)) = g(2X+5)
= (2X+5)-3
= 2X+2
(2) f(g(X)) = f(X-3)
= 2(X-3)+5
= 2X-6+5
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