| 单词 | quarter square |
| 释义 | > as lemmasquarter square quarter square n. Mathematics one quarter of the square of a number (esp. with reference to a method for multiplying two numbers by subtracting one quarter of the square of their difference from one quarter of the square of their sum); usually in plural. ΘΚΠ the world > relative properties > number > arithmetic or algebraic operations > [noun] > multiplication > into or by itself > square > fourth part of quarter square1841 1841 Penny Cycl. XIX. 199/2 A table which gives the squares of the halves of numbers will, by the addition of the squares of the halves or quarter-squares, give the product. 1946 A. Fletcher et al. Index Math. Tables 36 Glaisher has pointed out that the triangular numbers provide a useful variant of the quarter-squares method of multiplication. 1993 Amer. Math. Monthly 100 352 The use of identity 4AB = (A + B)2 − (A − B)2, which is sometimes referred to as the method of ‘quarter squares’. < as lemmas |
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