导数基本性质 |
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1,对常数项可以提出来(x代表关于x的函数): ( C x ) ′ = C x ′ (Cx)'=Cx' (Cx)′=Cx′ ( C x ) ( n ) = C x ( n ) (Cx)^{(n)}=Cx^{(n)} (Cx)(n)=Cx(n) 2,对加减项分开求导( x 1 和 x 2 x_1和x_2 x1和x2代表两个关于x的函数): ( C 1 x 1 + C 2 x 2 ) ′ = C 1 x 1 ′ + C 2 x 2 ′ (C_1x_1+C_2x_2)'=C_1x_1'+C_2x_2' (C1x1+C2x2)′=C1x1′+C2x2′ ( C 1 x 1 + C 2 x 2 ) ( n ) = C 1 x 1 ( n ) + C 2 x 2 ( n ) (C_1x_1+C_2x_2)^{(n)}=C_1x_1^{(n)}+C_2x_2^{(n)} (C1x1+C2x2)(n)=C1x1(n)+C2x2(n) 3,对乘法项求导: ( C x 1 x 2 ) ′ = C ( x 1 ′ x 2 + x 1 x 2 ′ ) (Cx_1x_2)'=C(x_1'x_2+x_1x_2') (Cx1x2)′=C(x1′x2+x1x2′) ( C x 1 x 2 ) ( n ) = C ( x 1 ′ x 2 + x 1 x 2 ′ ) ( n − 1 ) = C ( x 1 ′ ′ x 2 + 2 x 1 ′ x 2 ′ + x 1 x 2 ′ ′ ) = . . . . . . (Cx_1x_2)^{(n)}=C(x_1'x_2+x_1x_2')^{(n-1)}=C(x_1''x_2+2x_1'x_2'+x_1x_2'')=...... (Cx1x2)(n)=C(x1′x2+x1x2′)(n−1)=C(x1′′x2+2x1′x2′+x1x2′′)=...... 4,对除法项求导: ( x 1 x 2 ) ′ = x 1 ′ x 2 − x 1 x 2 ′ x 2 2 (\frac{x_1}{x_2})'=\frac{x_1'x_2-x_1x_2'}{x_2^2} (x2x1)′=x22x1′x2−x1x2′ ( x 1 x 2 ) ( n ) = ( x 1 ′ x 2 − x 1 x 2 ′ x 2 2 ) ( n − 1 ) (\frac{x_1}{x_2})^{(n)}=(\frac{x_1'x_2-x_1x_2'}{x_2^2})^{(n-1)} (x2x1)(n)=(x22x1′x2−x1x2′)(n−1) 可以利用导数的性质对上述式子进行证明,导数即为函数在某点的切线的斜率,即为在该点附近函数值得增量与自变量的增量之比(当自变量增量趋近于0时)。 |
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