(1-2+3-4+.....-98+99)x(2013x6-2013-2013x5)
=(1-2+3-4+....-98+99)x[ 2013x(6-1-5)]
= (1-2+3-4+....-98+99)x(2013x0)
= (1-2+3-4+....-98+99)x0 = 0
(1-2+3-4+.....-98+99)x(2013x6-2013-2013x5)
=(1-2+3-4+....-98+99)x[ 2013x(6-1-5)]
= (1-2+3-4+....-98+99)x(2013x0)
= (1-2+3-4+....-98+99)x0 = 0
\(\frac{3+5+7+.....+2013}{2+4+6+....+2012+x}\) =1
ai đúng mk tk !
cho m = 3 x 13 x 23 x 33 x 43 x 53 x .... x 2013
n = 2 x 4 x 6 x 8 x 12........ + 14 x 2014
p=m-n lớp 5
mong các bạn giúp mik rồi mik tik cho
e) 17/5 : X = 34/5 : 4/3
f) X : 4/5= 25/8 : 5/4
g) (X x 0,25 + 2012) x 2013 = (50 + 2012) x 2013
h) (X - 1/2) x 5/3 = 7/4 - 1/
a)S = 1 + 1/3 + 1/9 + 1/27 + ..................... + 1/2187
b)S = 1 + 1/2 + 1/4 + 1/8 + ..................... + 1/128 + 1/256
c)A = 1 + 2 + 4 + 8 + ..................... + 4096 + 8192
d)1/1 x2 + 1/ 2 x 3 + 1/ 3 x 4 + ................. + 1/ 2013 x 2014
h)A = 1/1 x3 + 1/ 3 x 5 + 1/ 5 x 7 + ................. + 1/ 2013 x 2015
bai2a)1/ 2 x (1 + 2) + 1/ 2 x (1 + 2 + 3) + ............ + 1/2 x (1 + 2 + 3 + ....... + 9)
ai nhanh tick đúng nha
các bạn giúp mik được ko mik xin đó mik đang cần gấp nhé
e) 17/5 : X = 34/5 : 4/3
f) X : 4/5= 25/8 : 5/4
g) (X x 0,25 + 2012) x 2013 = (50 + 2012) x 2013
h) (X - 1/2) x 5/3 = 7/4 - 1/
tinh bang cach thuan tien nhat : 1+2-3-4+5+6-7-8+9+...+2013+2014-2015-2016
Trong các phân số 5/6 ; 99/100 ; 3/2 ; 2013/2012 ; 2013/2014 phân số nào lớn nhất ?
tim x nha mn
l,[12 nhan 15 - x] nhan 1/4= 120 nhan 1/4
i, [x nhan 0,25 cong 2012 ] nhan 2013 =[50 cong 2012] nhan 2013
k,[ x - 1/2] nhan 5/3 = 7/4 - 1/2
a,
x-2/3-2/15-2/35-2/63=1/9
b
(x+1
3)+(x+1/9)+(x+1/27)+(x+1/81)=56/81
c,
(1/3*5+1/5*7+1/7*9+.....+1/19*21)*x=9/7
d,3+5+7+...+2015/2+4+6+...+2016+x=1
e,2/6+2/12+2/20+...+2/x*(x+1)=2013/2015