subtract是什么意思

subtract

英 [s?b'tr?kt] 美 [s?b'tr?kt]

1、sub- + tract-.

subtract 減

sub-,在下，向下，-tract,拉，詞源同 attract,contract.引申數(shù)學(xué)名詞減，減去。

subtract: subtract: [16] To subtract something is etymologically to ‘pull it away’. The word comes from subtractus, the past participle of Latin subtrahere ‘pull away’. This was a compound verb formed from the prefix sub-, usually ‘under’ but here used in the sense ‘a(chǎn)way’, and trahere ‘pull’ (source of English traction, tractor, trait, etc). The strictly mathematical use of the word is a post-Latin development.
=> contract, retract, traction, tractor, trait
subtract (v.): 1530s, "withdraw, withhold, take away, deduct," a back-formation from subtraction (q.v.), or else from Latin subtractus, past participle of subtrahere "take away, draw off." Related: Subtracted; subtracting. Mathematical calculation sense is from 1550s. Earlier verb form was subtraien (early 15c. in the mathematical sense), which is directly from the Latin verb.
Here he teches te Craft how tou schalt know, whan tou hast subtrayd, wheter tou hast wel ydo or no. ["Craft of Numbering," c. 1425]

1. Please subtract a quarter of the money for your own use.: 請從你的零用錢中扣除四分之一.

3. In their first year at school, most children learn to add and subtract.: 入學(xué)第一年, 多數(shù)孩子都學(xué)加減法.

4. When you subtract two numbers, you subtract a subtrahend from a minuend.: 當(dāng)你作兩個數(shù)的減法時, 你用一個被減數(shù)去減另一個減數(shù).

5. The little girl has begun to learn to add and subtract.: 這小女孩已在學(xué)做加減法了.