=\(\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}.\dfrac{4}{5}....\dfrac{2016}{2017}.\dfrac{2017}{2018}\)
\(\dfrac{1.2.3.4....2017}{2.3.4....2017.2018}\)
=\(\dfrac{1}{2018}\)
=\(\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}.\dfrac{4}{5}....\dfrac{2016}{2017}.\dfrac{2017}{2018}\)
\(\dfrac{1.2.3.4....2017}{2.3.4....2017.2018}\)
=\(\dfrac{1}{2018}\)
tinh :
A= ( 1-1/2) x ( 1-1/3) x ( 1-1/4) +.....+ ( 1-1/2017) x ( 1- 1/2018)
Tính GTLN hoặc GTNN và phân biệt đâu là GTLN và GTLN:
a) \(A=4-\left(x+1\right)^{2018}\)
b) \(B=\left(x-3\right)^2-2017\)
c) \(C=\dfrac{4}{\left(x+1\right)^2+2}\)
d) \(D=\left(2x-y+1\right)^{2018}+\left|y+1\right|+2017\)
\(\dfrac{x-2}{5}=\dfrac{x}{3}\)
\(\dfrac{x+23}{x+40}=\dfrac{3}{4}\)
A=\(\dfrac{1}{2}+\dfrac{1}{2^2}+\dfrac{1}{2^3}+.........+\dfrac{1}{2^{2017}}\)
B=1+2+22+23+.............+22017
A = 1 + 1 x 2 + 1 x 2 x 3 + 1 x 2 x 3 x 4 + 1 x 2 x 3 x 4 x 5 + ........... + 1 x 2 x 3 x ....... x 100 .
ai giúp zới
bai 1: Tinh nhanh
a) 1/2 + 1/4 + 1/8 + 1/16 + 1/32
b) 1/2 x 1/2 + 1/2 x 1/3 + 1/3 + 1/3 + 1/4 + 1/4 x 1/5 + 1/5 x 1/6
Bài 1: Tìm x, biết:
a, 2/1/4x - 9/1/4 = |-20|
b, 1/2x + 2/3. ( x-2) =1/3
c, x- 25% = 6/11. (1/2+ 3/4 - 1/3)
d, - (-23) + (-36) - |-57| + (-29) .2
e, x/30 = 3/10 + -1/15
f, (x - 1/4) : 4/5 = 15/16
g, 1/3/5- 7/12 :x - -9/4
h, (2/4/5. x +50 ). 2/3 = -51
Tìm x biết
a,(3x-1).1/2x+5=0
b,-5.(x+1/5)-1/2.(x+3/5)=-x+1/5
c,2|1/2x-1/3|-3/2=1/4
d,|20/9-x|=1/12+1/20+1/30+1/42+1/56+1/72
e,1/2.3.x+1/3.4.x+1/4.5.x+...+1/49.50.x=1
MÌNH ĐANG CẦN GẤP.CẢM ƠN CÁC BẠN ĐÃ GIÚP!!!!
Câu1: tìm số nguyên x mà -35/6<x>-18/5
Câu2 : so sánh A=2015/2016+2016/2017 và B= 2015+2016/2016+2017
Câu3 : tìm số nguyên x biết rằng : 1/3+1/6+1/10...+2/x(x+1) =2007/2009
Cho x1+x2+x3+...........+x2017=0
và x1+x2+x3=x4+......=x2014+x2015+x2016=1
Tính x2017
Cảm ơn rất nhiều ai đã giúp mình nhé