解:原式=2.236+0.143﹣(4.375﹣0.75)
=2.236+0.143﹣3.625
=2.379﹣3.625
=﹣1.246
≈﹣1.25.
下列标点符号使用不正确的一项是 ( )
——Doctor! I can't fall at night.——Don't worry! You are too stressed. Just be relaxed and take some pills, then you'll be better.
Linda's parents gave her ______ advice on how to make friends with others.
1961年,中共中央召开全国经济工作会议,对国民经济提出“调整、巩固、充实、提高”的方针。这一事件产生的历史背景是( )