TÍNH
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+........+\frac{1}{2015.2016}\)
Bài 1 : Tính nhanh
a, 0,36 .350 + 1,2 .20 . 3 + 9 . 4 . 4,5
b, B = 2015.2016-5/2015.2015+2010
c, C = 2/1.3 + 2/3.5 + 2/5.7 + .......+ 2/69.71+ 2/71.73
d, D= (1+1/2) . ( 1+1/3) . (1+1/4) ...... (1+1/2017) . (1+1/2018)
e, E=1/4.5 + 1/5.6 + 1/6.7+........+1/79.80+1/80.81
f, F=3/2.3 + 3/3.4 + 3/4.5 + .......+ 3/99.100
g, G= 5/1.4 + 5/4.7 + 5/7.10 + .......+5/61.64
nhanh nha , mk cần gấp
tính nhanh biểu thức sau
A.1/2+1/4+1/8+1/16+1/32
B.2/1.2+2/2.3+2/3.4+......+2/18.19+2/19.20
A=1.2+2.3+3.4+4.5+...+98.99
B=1^2+2^2+3^2+4^2+...+98^2
tính A-B
tính nhanh:
B=1+2+4+5+7+8+10+...+119+121+122
C=1.2+2.3+3.4+...+58.59+59.60
Tính hiệu giữa A và B.
A=1/2.3+2/3.4+3/4.5+...+7/8.9+8/9.10
B=1/2+1/3+1/4+1/5+1/6+...+1/9
1.Tính nhanh
A=1+2+3+...+2018;B=1+3+5+...+2017;C=2+4+6+...+2018
D=72.153+27.153+153;E=1.2+2.3+3.4+...+49.50
(1/1.2+1/2.3+1/3.4+.......+1/8.9+1/9.10) .100-(5/2:(x +206/100):1/2=89
(1/1.2 + 1/2.3+ 1/3.4+...+ 1/8.9 + 1/9.10) .100 - [5/2: (x + 206/100)] : 1/2 =89
