chứng tỏ rằng:

a) 1.3.5. ... .99= 51/2.52/2. ... .100/2

b) 1-1/2+1/3-...-1/1990=1/996+1/997+...+1/990

Chứng tỏ rằng:

a) 1.3.5.....99=51/2.52/2....100/2;

b) 1-1/2+1/3-....-1/1990=1/996+1/997+...+1/1990

Chứng tỏ rằng 

a, 1*3*5*...*99=(51/2)*(52/2)* ... * (100/2)

b, 1-1/2+1/3-1/4+...-1/1990=1/996+1/997+...91/1990

Chứng minh rằng1-1/2+1/3-...-1/1990=1/996+1/997+...+1/990

Chứng tỏ rằng:

\(1-\frac{1}{2}+\frac{1}{3}-...-\frac{1}{1990}=\frac{1}{996}+\frac{1}{997}+...+\frac{1}{990}\)

Chứng tỏ rằng:

a) \(1.3.5.........99=\frac{51}{2}.\frac{52}{2}......\frac{100}{2}\)

b)\(1-\frac{1}{2}+\frac{1}{3}-...........-\frac{1}{1990}=\frac{1}{996}+\frac{1}{997}+.......+\frac{1}{1990}\)

                                                       ĐANG CẦN GÂP

chứng tỏ rằng 1 - 1/2 + 1/3 - 1/4 + .... - 1/1990 = 1/996 + 1/997 + 1/998 + ... + 1/1990

1,CMR:\(1-\dfrac{1}{2}-\dfrac{1}{3}-...-\dfrac{1}{1990}=\dfrac{1}{996}+\dfrac{1}{997}+...+\dfrac{1}{990}\)

1,CMR:
B,\(1-\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{4}-...-\dfrac{1}{1990}=\dfrac{1}{996}+\dfrac{1}{997}+\dfrac{1}{990}\)