How do I get this function to add or subtract from a range and return it?

我如何得到这个函数添加或减去从一系列还吗？

youdao

Understand and grasp the simple ways to add or subtract a number which is close to a round number.

理解并掌握一个数加上或减去接近整十、整百的数的简便算法。

youdao

This is not to say that one should be sloppy with Numbers to add or subtract an order of magnitude.

这并不是说，随便一个电话号码，应该是增加或减少某些问题的严重性。

youdao

And since we don't have to charge compensate, we can add or subtract neutrons at liberty.

因为我们没有电荷补偿，我们就可以随意地加上火减少中子。

麻省理工公开课 - 固态化学导论课程节选

But all of you in this room probably remember what we technically call the base 10 system or decimal system because back in grade school or the like, you learned to count and add and subtract numbers by way of columns.

但是，在座的每一位可能都记得,这在小学的时候学的,以10为进制的系统或者十进制系统,通过数列方式学习数数和加减法。

哈佛公开课 - 计算机科学课程节选

Meaning that, like a connoisseur able to recognize a Rembrandt across a museum gallery, through a combination of education, experience and deduction Mr. Malle can recognize the component parts and knows what to add or subtract to create something special.

WSJ: On the Scent of Luxury With an Upper East Side Perfumer

After the initial contributions had been made, the game continued for a random number of turns, with each player, in turn, being able to add to or subtract from his contribution to the pool.

ECONOMIST: Human evolution

Clients can choose to add hardware or subtract machines, like an extra server or storage device, in seconds.

FORBES: Magazine Article