Bài 1 : Cho : A = \(\frac{1}{51}\) + \(\frac{1}{52}\) + . . . + \(\frac{1}{100}\)B = 1 - \(\frac{1}{2}\) + \(\frac{1}{3}\)- \(\frac{1}{4}\) + ... + \(\frac{1}{99}\)- \(\frac{1}{100}\)C = \(\frac{1}{1.2}\) + \(\frac{1}{3.4}\) + \(\frac{1}{5.6}\)+ . . . + \(\frac{1}{99.100}\) So sánh A với B với C Bài 2 :Cho :A = \(\frac{1}{1.2}\) +\(\frac{1}{3.4}\) + . . . + \(\frac{1}{999.10000}\)B = \(\frac{1}{501.1000}\) + \(\frac{1}{502.999}\) + . . ....
Đọc tiếp
Bài 1 :
Cho :
A = \(\frac{1}{51}\) + \(\frac{1}{52}\) + . . . + \(\frac{1}{100}\)
B = 1 - \(\frac{1}{2}\) + \(\frac{1}{3}\)- \(\frac{1}{4}\) + ... + \(\frac{1}{99}\)- \(\frac{1}{100}\)
C = \(\frac{1}{1.2}\) + \(\frac{1}{3.4}\) + \(\frac{1}{5.6}\)+ . . . + \(\frac{1}{99.100}\)
So sánh A với B với C
Bài 2 :
Cho :
A = \(\frac{1}{1.2}\) +\(\frac{1}{3.4}\) + . . . + \(\frac{1}{999.10000}\)
B = \(\frac{1}{501.1000}\) + \(\frac{1}{502.999}\) + . . . +\(\frac{1}{999.502}\) + \(\frac{1}{1000.501}\)
Tính \(\frac{A}{B}\) = ?
bn làm như vầy nè
a=1/51+1/52+...+1/100
A=1/3.1/7 + 1/2.1/26+....1/2.1/50
A=1/3-1/7+1/2-1/26+...1/2-1/50
A=1/3-1/50
A=47/50
như vầy đó bn tin mik đi