That is a preperation for coordinate systems; have please a look at ry1 .
Even powers of integers are whole (natural) numbers .
b can not be equal to or grater than 5, because ... .
5!=5x4x3x2x1 . 0! is defined to be 1.
5! = 5 x 4! i.e. 5!-4! = 4x4! .
[1+1/(1+2/S)]=3 i.e. 1/(1+2/S)=2 i.e. 1+2/S=1/2 i.e. 2/S=-1/2 .
The first equation means 5xA = 3xB, i.e. 6xA = 3xB +A ve 6xA + B = ... .
ry1 & http://www.9math.com/book/sum-squares-first-n-natural-numbers .
For quick answer take A=1. Get(1+4+9+4)/3 = 6 and compare ... (2xA+4 seems to be proper) .
Calculate A+2xA+2+3xA+9+4 = 6xA+12 and divide by 3 if you want to be a sure hand ... .
1*(-2)= 2x1 - (-2) = 4 and 4Δ3 = 4^{2} - 3^{2} = ... .
Consider 543-143 = 396 as an example .
Since +10xB+C-100xC-10xB-A = 99x(A-C) , the result should be multiples of 99, i.e. anyone of
99, 198, 297, 396, 495, 594,693, 792 and 891 . They all have ... at tens .
The operation is commutative. have please a look at ry1 .
3 digits having a sum of 15:0,6,9 and 0,7,8 ; 1,5,9 ; 1,6,8 and 1,7,7 ... .
Connect points A and be to have a 7 sided polygon whose sum of inner angles is (7-2)·180°=900° .
The sum of the angles given is 775° .
- 56490 + 59460 = 2970 .
This is operation priority: Powers, division and multiplication, addition and subtraction. Paranthesis
are blocks whose simplest form or numerical value is first to be determined. Without evaluating the parantehsis, operations can not be
performed.
The convention in case of operations having equal priorities is to evaluate the first operation prior to the next. Paranthesis are
generally used to avoid ambiguity in such cases .
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