S = 4/2.3 . 10/3.4 ..........9898/ 99.100
S= 1.4/2.3 . 2.5/3.4 . 3.6/4.5 .......98.101/99.100
S = (1.2.3...98).(4.5.6...100).1014/(2.3.4...98).99.(4.5.6...100).3
S=101/99.3
S=101.297
S = ( 1-2/2.3).(1-2/3.4).(1-2/4.5).....(1-2/2015.2016)
Tính tổng
S = \(\left(1-\frac{2}{2.3}\right).\left(1-\frac{2}{3.4}\right).\left(1-\frac{2}{4.5}\right).....\left(1-\frac{2}{2015.2016}\right)\)
tính (1-1/1.2)+(1-1/2.3)+(1-1/3.4)+...+(1-1/2015.2016)
1:Tìm x, biết:
a) (3/5)^2x-1 = 125/27
b)1/2+(1/2.3)+(1/3.4)+...+(1/2015.2016)-2x=1/2-1/2016
c)/2x^2+/x-2//=2x^2+3
Tìm x, biết:
a, (3/5)^2x-1=125/27
b,1/2+1/2.3+1/3.4+...+1/2015.2016 - 2x=1/2-1/2016
c,/2x^2+/x-2//=2x^2+3
1.Tính
A= (1-1/22).(1-1/32)...(1-1/1002)
B= -1/1.2-1/2.3-1/3.4-...-1/100.101
C= 1.2+2.3+3.4+...+100.101
Tính tổng:S=1+2+3+...+200
S=1+1/2+1/4+1/8+...+1/1024
S=1.2+2.3+3.4+...+99.100
Giai nhanh giup minh trong 15 phut nhe
Tìm: \(\frac{x}{2}+\frac{x}{2.3}+\frac{x}{3.4}+...+\frac{x}{2015.2016}=\frac{2015}{4032}\)
tính hơp lí
m =( 1 - 2/2.3).(2/3.4).....(1-2/99.100)
