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f(g(x))のg(x)は自己変数全体に相当し、実際にはf(x)のx、f(2)、すなわち2=g(x) g(x)=x-1,得2=x-1,x=3,帶入f(g(x))=x+1,實際是f(x)=x+1,所以f(2)=4
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