Algebra för Ma1A: Skillnad mellan sidversioner

Versionen från 1 oktober 2014 kl. 21.20

Från Quora:

Wu's Squaring Trick, named after the famous Scott Wu, is a technique used to quickly square numbers over 25 in your head. It uses the identity

n² = (n-25) \cdot 100 + (n-50)²

For example,

62^2 = 37 \cdot 100 + 12^2 = 3844

44^2 = 19 \cdot 100 + 6^2 = 1936

77^2 = 52 \cdot 100 + 27^2 = 5929

These mental computations can be done very quickly with just a little practice, so amaze your friends with how fast you can square two digit numbers!

@@ Rad 5: / Rad 5: @@
 Wu's Squaring Trick, named after the famous Scott Wu, is a technique used to quickly square numbers over 25 in your head. It uses the identity
-:                            n^2 = (n-25) \cdot 100 + (n-50)^2
+:                            n<sup>2</sup> = (n-25) \cdot 100 + (n-50)<sup>2</sup>
 For example,