呵呵,直接代入啊...f(f(x))=a(ax+b)+b=a^2x+ab+b.
f(f(x))+f(x)=a^2x+ax+ab+2b...要满足在任意情况下都等于右边6x+60.
则对应的系数要相等哦,对应项的.
a^2+a=6.a=2 或 a=-3
ab+2b=60 当a=2时,b=15..当a=-3时,b=-60..
所以满足条件的（a,b）为
（2,15） （-3,-60）
求一道英文数学题!consider the linear function f(x)=ax+b.compute all
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