2015 + 2015 . 2 + 2015 . 3 + 2015 x 4
M=20154/x^4 -2015^4/x^2y^2+3×2015^3/x^3+3×2015^3/x^2y+2015
Biết 2015/x+3=2015/y
tìm M
2015 + 2015 . 2 + 2015 . 3 + 2015 x 4 = ?
2015 + 2015 x 2 + 2015 x 3 + 2015 x 4 = 2015 x ( 1 + 2 + 3 + 4 )
= 2015 x 10 = 20150
1/2015 x 2/2015 x 3/2015 x 4/2015 x 5/2015 x .... x 10/2015
Trả lời nời tớ nhé. Tớ sẽ tick cho. Nhưng mà phải đúng đấy
a, 2015 2015 ( - x ) = 2015 2015
b ,1 + 2 + 3 + 4 + ..........+ x = 378
c, x + 2x + 3x + ...........+ 99x = 2 + 4 + 6 + .............+ 198
a, (-x) = 2015^2015:2015^2015 => (-x) =1 => x=-1
b, x = 27 c, x = 2
^_^ Tick nhé ^_^
a, 20152015(-x)=20152015
=>20152015 :20152015=-x
=>1=-x
=>x=-1
Tinh:
S=2015 + 2015/1+2 +2015/1+2+3 + 2015/1+2+3+4 +... + 2015/1+2+3+...+2016
Tinh:
S=2015 + 2015/1+2 +2015/1+2+3 + 2015/1+2+3+4 +... + 2015/1+2+3+...+2016
(2/3 + 3/4 + 4/5 +... + 2016/2017) x (1/2 + 2/3 + 3/4 + ...+ 2015/2016) - (1/2 + 2/3 + 3/4 +...+2015/2016) x (2/3 + 3/4 + 4/5 +...+2015/2016)
Tính nhanh: (12015 - 1012015)x(22015 - 1002015)x(32015 - 992015)x ... x(1012015 - 12015)
tìm x biết: (x-2015)2015x - (x-2015)(2015x+2015) +32015 - 3 = 2(31+32+33+34+......+32014)