The main activity of today where the excercises

The words that are in red are for having careful in the time you are doing the exercise and the blue ones are those that we can have more difficulty. These appear at the down part with it signification.

Today in class we've revised the four properties that ''tomiindependentzia'' explained in the last entrance, doing exercises. But doing the operations we have learned new thing like:


a) When you have to multiply/divide two different bases that are raised to an exponent and these operation at the same time is raised to an other exponent, you can't multiply the bases.

Example: (72 · 94)2 = 72·2 · 94·2 = 74 · 98

b) Also if we have to multiply numerators with different bases and are raised to an exponent we can simplify the base to have the same. Careful: if the base changes the exponent also!

Example: 25 · 43 = 25 · (22)3 = 25 · 26 = 211

c) When you finish a negative operation and the exponent that is raised to is even the base converts in positive. If it is odd it keeps negative.

Example: (-9)6 : (-9)2 = (-9)4 = 94
-(-2)3 = 23 = 8

Those where the three things we have to have in mind when we are operating.

even: that number that you can divide it by two (par)
odd: That number that you can't divide it by two (impar)


Something interesting: look all the things you can obtain with the pieces of a cube
!
http://www.youtube.com/user/cubert01?v=gidumziw4JE&feature=pyv&ad=6610669523&kw=de