= (1/2013 + 12/2014 + 123/2015) x 0
= 0
= (1/2013 + 12/2014 + 123/2015) x 0
= 0
Tính M = a1+a2+a2015 biết a1,a2,a3,.........,a2015 là các số nguyên thỏa mãn a1+a2+.....+a2015 = 0 và a1+a2=a3+a4=a5+a6=.....=a2013+a2014=a2015+a1=2
Câu 6 : tìm x:
a) x+1/2016-x+2/2015=x+2017/2014
b) 5 - |3x - 1|= 3
c) (1 - 2x)2= 9
tìm tập hợp các số nguyên k biết: 204/-486-(-7/9)^2<k_<(2010/2012+2012/2013+2013/2014)*(1/2-1/3+-1/6)
So sánh:
A=(1-\(\dfrac{1}{2} \))(1-\(\dfrac{1}{3}\))(1-\(\dfrac{1}{4}\))....(1-\(\dfrac{1}{2014}\))
B=12015 :2015
Tìm x:
\(1+\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{10}+...+\dfrac{2}{x\left(x+1\right)}=1\dfrac{2015}{2017}\)
Tìm x biết \(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x\left(x+1\right)}=\frac{2015}{2017}\)
Thực hiện phép tính, tính nhanh nếu có thể
a, \(\dfrac{7}{13}\) + \(\dfrac{12}{13}\) + \(\dfrac{6}{-13}\)
b, ( \(\dfrac{4}{5}\) + \(\dfrac{1}{2}\) ) x ( \(\dfrac{6}{13}\) - 2 )
c, 75% : \(\dfrac{1}{2}\) - \(2\dfrac{1}{2}\) x ( \(-1\dfrac{1}{3}\) )
d, 0,375 x \(1\dfrac{3}{5}\) + 60% x \(\dfrac{2}{7}\) + \(\dfrac{3}{5}\) x \(\dfrac{5}{7}\)
e, \(\dfrac{-5}{6}\) x \(\dfrac{7}{13}\) + \(\dfrac{19}{13}\) : \(\dfrac{6}{-5}\) + \(\dfrac{2}{5}\)
f, 1,25 x \(\dfrac{7}{9}+\dfrac{5}{4}x\dfrac{15}{9}-1\dfrac{1}{4}:\dfrac{19}{3}\)
x=1/4+2/13
x/3=2/3+-1/7
-8/3+1/3<x<-2/7+-5/7
-5/6 +8/3+29/-6=<x>=-1/2+2+5/2
1/6+2/5
3/5+-7/4
4/13+-12/30
-3/29+16/58
8/40+-36/45
-8/18+15/27
Bài1 :Tìm x:
( 6 : 3/5 - 17/16 . 6/7 / 21/5 . 10/11 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 / 10/3 + 2/9 ) . x = 215/96
Ai nhanh mk K ạ.