multiply-divide

基本解釋

Simple math tool to practice add, subtra - Simple math tool to practice add, subtract, multiply, and divide.
簡單的數(shù)學(xué)工具用來執(zhí)行加，減，乘，除運算。
Where they fared less well was number ability (how quickly you can multiply, add, subtract and divide) and perceptual speed - how fast you can push a button when prompted.
年長者表現(xiàn)不太好的方面則是：（數(shù)字能力加減乘除運算的速度）以及感知速度——聽到指令按下按鈕的速度。
So, the number of nuclei, 119 if we were to sit and count these as well, is 119. So, we'll multiply that by just pi, r squared, to get that cross-section, and divide all of that by 1 .
如果你們數(shù)的話，原子核的數(shù)是，我們用它乘以πr的平方，得到橫截面積，除以1。

So, the number of nuclei, 119 if we were to sit and count these as well, is 119. So, we'll multiply that by just pi, r squared, to get that cross-section, and divide all of that by 1 . 39 meters squared.
如果你們數(shù)的話，原子核的數(shù)是，我們用它乘以πr的平方，得到橫截面積，除以1。39平方米。
麻省理工公開課 - 化學(xué)原理課程節(jié)選

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