Tuyển Cộng tác viên Hoc24 nhiệm kì 26 tại đây: https://forms.gle/dK3zGK3LHFrgvTkJ6
\(C=\left(1-\frac{1}{1.2}\right)+\left(1-\frac{1}{2.3}\right)+...+\left(1-\frac{1}{1995.1996}\right)\)
\(C=\left(1-1-\frac{1}{2}\right)+\left(1-\frac{1}{2}-\frac{1}{3}\right)+...+\left(1-\frac{1}{1995}-\frac{1}{1996}\right)\)
\(C=1\times998+1-\frac{1}{1996}\)
\(C=998+\frac{1995}{1996}\)
\(M=\left(1-\frac{1}{1.2}\right)+\left(1-\frac{1}{2.3}\right)+...+\left(1-\frac{1}{1995.1996}\right)\)
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
1/1.2+1/2.3+1/2.3+...+1/2016.2017
A=1/1.2+1/2.3+1/2.3+...+1/99.100
Tính C:
C=\(\text{}\dfrac{1}{9.10}-\dfrac{1}{8.9}-\dfrac{1}{7.8}-....-\dfrac{1}{2.3}-\dfrac{1}{1.2}\)
Giúp mik với!!!
1/1.2 + 1/2.3 + 1/3.4 + ....+ 1/9.10
1/1.2 + 1/2.3 + ... +1/x(x+1)
tính (1-1/1.2)+(1-1/2.3)+(1-1/3.4)+...+(1-1/2015.2016)
A=1/1.2+1/2.3+1/3.4+...+1/13.14