第一个公式是用220减去你的年龄从而得到你的最大心跳频率。

For the first, subtract your age from 220 to find your maximum heart rate.

youdao

毛利润的计算方式是营业收入减去销售成本。

Gross profit is calculated as revenues minus cost of sales.

youdao

在默认情况下，数据库共享内存的大小是1.75 GB减去堆栈大小。

By default, the database Shared memory is 1.75gb minus the Stack.

youdao

All right, so the bonding order, you're correct, should be 2, if we subtract the number of bonding minus anti-bonding electrons and take that in 1/2.

好，你们是对的，键序为，如果我们用成键数,减去反键数除以2。

麻省理工公开课 - 化学原理课程节选

So we're just subtracting, in effect, zero, right, from the enthalpy of the product, but of course it's important have that established because the heat of formation is something you could measure, right?

所以从效果上说，我们只是，从生成物的焓中减去了零，但，是确立这一点很重要,因为生成热是,你能测量的东西，对吧？

麻省理工公开课 - 热力学与动力学课程节选

PROFESSOR: And I didn't write up there but it is one, 1 and we can see that it's 1, 2 because it's 1/2 of 2, 4 minus 2, so 1/2 of 2, the bonding order is going to be equal to one.

教授：我没有写出来，但是是1，我们可以看到为什么是，因为它等于1/2的2，4减去，所以1/2的2，键序等于1。

麻省理工公开课 - 化学原理课程节选