設(shè)函數(shù)u=u(x),v=v(x)都在點(diǎn)x處可導(dǎo),那么u(x)±v(x),u(x)·v(x),(u(x))/(v(x))(v(x))≠0)都在點(diǎn)x處可導(dǎo),且(1) [u(x)±v(x)]′=u′(x)±v′(x);(2) [u(x)·v(x)]′=u ′(x)·v(x)+u(x)·v′(x);(3) [Cu(x)]′=Cu′(x)(C是常數(shù));(4).上述法則可用導(dǎo)數(shù)的定義來證明,此處略.和、差 (共 549 字) [閱讀本文] >>