2022.03
2022.03.01复合函数
f(x)=x+5 , g(x)= x²-3
f(g(x))= x²+2
g(f(x))= x²+10x+22
f(f(x))= x+10
g(g(x))= ( x²)² -6x²+6
二项式的平方公式
( a+ b)²=a²+2ab+b²
整式运算,多项式乘以多项式
(a+ b)(a+ b)
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