已知向量 a 和 b 互相垂直，且 . 计算： |(3 a ＋ b )× ( a －2 b )|=84/js/editor20150812/themes/default/images/spacer.gif
举一反三
- 已知：则反应的稳定常数为/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif
- 3.The swimmer to cross the English Channel but failed./js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif
- 在力法方程中，称为 ，表示 ，称为 ，表示 。/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif
- 6．合理的刀具耐用度包括 与 两种。/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif
- 所谓交流负反馈是指 的反馈。 （A．放大倍数为负数， B．变小，C．变大。）/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif/js/editor20150812/themes/default/images/spacer.gif