M = 1-2-3+4 + 5-6-7+8+9-10-11+12+....+2013-2014-2015+2016

M = (1-2-3+4)+(5-6-7+8) + (9-10-11+12)+..... + (2013 - 2014 - 2015 - 2016)

M = 0  + 0 + 0 + ..... + 0

M = 0 

\(;l\\ 54\backslash54\)

a) 1007-0/2=503.5

b)

\(P=\frac{3^{2016}-6^{2016}+9^{2016}-12^{2016}+15^{2016}-18^{2016}}{-1^{2016}+2^{2016}-3^{2016}+4^{2016}-5^{2016}+6^{2016}}\)

\(=\frac{\left(1.3\right)^{2016}-\left(2.3\right)^{2016}+\left(3.3\right)^{2016}-\left(4.3\right)^{2016}+\left(5.3\right)^{2016}-\left(6.3\right)^{2016}}{-1^{2016}+2^{2016}-3^{2016}+4^{2016}-5^{2016}+6^{2016}}\)

\(=\frac{1^{2016}.3^{2016}-2^{2016}.3^{2016}+3^{2016}.3^{2016}-4^{2016}.3^{2016}+5^{2016}.3^{2016}-6^{2016}.3^{2016}}{-1^{2016}+2^{2016}-3^{2016}+4^{2016}-5^{2016}+6^{2016}}\)

\(=\frac{-3^{2016}\left(-1^{2016}+2^{2016}-3^{2016}+4^{2016}-5^{2016}+6^{2016}\right)}{-1^{2016}+2^{2016}-3^{2016}+4^{2016}-5^{2016}+6^{2016}}\)

\(=-3^{2016}\)

1. Số số hạng tổng S là:

     (2016-3):3+1=672

Tổng S là:

     (3+2016).672:2=678384

3. 

231-(x-6)=1339:13

231-(x-6)=103

x-6=231-103

x-6=128

x=128+6

x=134

Bài 1 :

S = 3 + 6 +..........+ 2016

SSH = ( 2016 - 3 ) : 3 + 1 = 672

Tổng S = ( 2016 + 3 ) x 672 : 2 = 678384

Bài 2

Số tận cùng của 7⁹ + 3 là : 0

Bài 3

 231 - (x - 6) = 1339 : 13

 231 - (x - 6) = 103

x - 6 = 231 - 103

x - 6 = 128

x = 128 + 6

x = 134

Hok tốt

a,(2016 + 2).1008:2=1017072

b,(2001+5).500:2=501500

c,

501 500