知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 What is the food you want about your place. What's the last meal you cooked for some other person? What on earth is the most expensive food you've got at any time eaten? What is the costliest cafe you have ever been to? 这个其实是欧拉公式，其中 表示任意实数， 是自然对数的底数， 是复数中的虚数单位，则根据欧拉公式有： https://www.ecom-group.com/training-events/sap-cloud-integration-suite-cld900/