一、细审题，巧选突破口做计算题．首先要审清题意，然后确定从什么地方入手，这个入手处就是突破口。突破口找得好，就能够使解题步骤简洁明了，不易出错。[例1]特足量的H；通入盛有3．12克的WO3和CuO的混合物的试管内，在高温下充分反应后，质量减轻0．64克，问原5昆合物中WO 1. Carefully examine the questions and carefully select the breakthrough to do calculations. The first thing to do is to review the meaning of the problem and then determine where to start. This is the starting point. Breakthroughs to find good, you can make the problem-solving steps concise and easy to go wrong. [Example 1] An adequate amount of H was introduced into a test tube containing a mixture of 3.12 g of WO3 and CuO and sufficiently reacted at a high temperature to reduce the mass by 0.64 g.