y=ax+b æ±å¯¼:y'=a
y=ax^2+bx+c æ±å¯¼:y'=2ax+b
y=ax^3+bx^2+cx+d æ±å¯¼:y'=3ax^2+2bx+c
y=ax^4+bx^3+cx^2+dx+e æ±å¯¼:y'=4ax^3+3bx^2+2cx+d
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