88-1/6-2/7-3/8-...-88/93
\(C=\dfrac{88-\dfrac{1}{6}-\dfrac{2}{7}-\dfrac{3}{8}-...-\dfrac{88}{93}}{-\dfrac{1}{12}-\dfrac{1}{14}-\dfrac{1}{16}...\dfrac{1}{186}}\)
tính C
C = ( 88 - 1/6 - 2/7 - 3/8 - ... - 88/93 ) / ( -1/12 - 1/14 - 1/16 - ... - 1/186 )
D = 1 - 5/6 + 7/12 - 9/20 + 11/30 - 13/42 + 15/56 - 17/12 + 19/90
các cou ui zải zúp mk bài này nhé:333
mk hứa sẽ chấm đúng:))
trâng trọn cảng ơm ^-^
\(\dfrac{\left(1-\dfrac{1}{6}\right)+\left(1-\dfrac{2}{7}\right)+\left(1-\dfrac{3}{8}\right)+...+\left(1-\dfrac{88}{93}\right)}{\dfrac{-1}{12}-\dfrac{1}{14}-\dfrac{1}{16}-...-\dfrac{1}{186}}\)
\(\dfrac{\left(1-\dfrac{1}{6}\right)+\left(1-\dfrac{2}{7}\right)+\left(1-\dfrac{3}{8}\right)+...+\left(1-\dfrac{88}{93}\right)}{\dfrac{-1}{12}-\dfrac{1}{14}-\dfrac{1}{16}-...-\dfrac{1}{186}}\)
Rút gọn:
\(A=\left(1-\dfrac{1}{6}\right)+\left(1-\dfrac{2}{7}\right)+...+\left(1-\dfrac{88}{93}\right)\)
88-\(\frac{1}{6}\)-\(\frac{2}{7}\)-\(\frac{3}{8}\)-.......-\(\frac{88}{93}\)
-\(\frac{1}{12}\)-\(\frac{1}{14}\)-\(\frac{1}{16}\)-......-\(\frac{1}{186}\)
giải theo cách hợp lí
Tính các tổng sau:
1, S=1-2+3_4+..+25-26
2, S=1-3+5-7+...+49-51
3, S=-1+3-5+7-...-53+55
4, S=2-4+6-8+...+22-24
5, S=-2+4-6+8-...-26+28
6, S=2-5+8-11+...-29+32
7, S=-1+5-9-13-...-41-45
8, S=1-5+9-13+...++89-93
9, S=2-4+6-8+...+202-204
10, S=1-6=11-16+21-26+...+171-176
huhu giúp mình với ạ 2h chiều nay mình phải nộp r =(((
số 2 : tính nhanh
A = 99 - 97 + 95 -93 + 91 - 89 + .......... + 7 - 5 + 3 - 1
B = 50 - 49 + 48 - 47 + 46 - 45 + ........... + 4 - 3 + 2 - 1
C = 100 + 98 + 96 + ......... + 2 - 97 - 95 - ......... - 1
D = 1 + 3 + 5 + 7 + ......... + 999
E = 1 + 11 + 21 + 31 + ......... + 991
F = 3 + 7 + 11 + 15 + ......... + 99
H = 1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 + 9 - 10 - 11 - 12 + .......... + 97 + 98 + 99 - 100 -101 - 102
I = 1 - 3 + 5 5 - 7 + 9 - 11 + ... + 2004 - 2007
K = -1 + 2 - 3 + 4 - 5 + 6 - 7 +.... + 2004 - 2005
G =1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 +..... + 2004 + 2005
N = 1 - 4 + 7 - 10 + ..... + 2995 - 2998