Algebra för Ma1A: Skillnad mellan sidversioner

Versionen från 1 oktober 2014 kl. 21.19

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

n^2 = (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^2 = (n-25) \cdot 100 + (n-50)^2
 For example,
-^2 = 37 \cdot 100 + 12^2 = 3844
+:                            62^2 = 37 \cdot 100 + 12^2 = 3844
+:
-^2 = 19 \cdot 100 + 6^2 = 1936
+:                            44^2 = 19 \cdot 100 + 6^2 = 1936
+:
-^2 = 52 \cdot 100 + 27^2 = 5929
+:                            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!