Algebra för Ma1A: Skillnad mellan sidversioner

Versionen från 1 oktober 2014 kl. 21.21

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

[math]\displaystyle{ n^2 = (n-25) \cdot 100 + (n-50)^2 }[/math]

For example,

[math]\displaystyle{ 62^2 = 37 \cdot 100 + 12^2 = 3844 }[/math]

[math]\displaystyle{ 44^2 = 19 \cdot 100 + 6^2 = 1936 }[/math]

[math]\displaystyle{ 77^2 = 52 \cdot 100 + 27^2 = 5929 }[/math]

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<sup>2</sup> = (n-25) \cdot 100 + (n-50)<sup>2</sup>
+:                   <math>                    n^2 = (n-25) \cdot 100 + (n-50)^2  </math>
 For example,
@@ Rad 11: / Rad 11: @@
 :                <math>            62^2 = 37 \cdot 100 + 12^2 = 3844    </math>
 :
-:                            44^2 = 19 \cdot 100 + 6^2 = 1936
+:                <math>                       44^2 = 19 \cdot 100 + 6^2 = 1936  </math>
 :
-:                            77^2 = 52 \cdot 100 + 27^2 = 5929
+:                          <math>             77^2 = 52 \cdot 100 + 27^2 = 5929  </math>
 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!