And now we want to find the subset of a that has the maximum value, subject to the weight constraint.
会有一个值与其对应,现在我们想要找出满足,重量约束条件的a的最大值子集。
And is able to then say, inside of that class definition, find the value of x.
这个类的定义这里然后取值,也可以这么说,在类的定义的里面。
Then go to the x equation and demand that this be equal to the desired x value and find the time.
然后列出关于 x 的方程,令这个式子等于给定的 x,并求出时间
And then this second term, if we go to the Periodic Table, 2 we will find that the value here for hydrogen is 2.2 98 and the value for fluorine is 3.98.
再算上第二个条件,翻看元素周期表,我们查处H,F电负性分别为2,2。2,3。
Well, I could look at the value here, and compare it to the value I'm trying to find, and say the following; if the value I'm looking for is bigger than this value, where do I need to look? Just here.
然后把它和目标数做个比较,然后做出如下的判断:,如果目标值大于这个值;,那么我应该去哪找呢?对,应该在这里,对不对?不可能在那儿。
You see an object in motion, you find a and you give a a certain numerical value, 10 meters per second squared.
你看到一个物体在运动,你会发现它的 a,然后给 a 赋值,10 米每秒平方
if I say a particle's location is i times t^2 plus j times 9t^3, for every value of time, you can put the numbers in and you can find the velocity by just taking derivatives.
一个质点的位置,i ? t^2 + j ? 9t^3,在每一个时间点,你可以把数值代入,并通过求导得到速度
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