\(\dfrac{2}{3}+\dfrac{4}{37}+\dfrac{5}{111}+\dfrac{260}{1443}\)
\(=\dfrac{2}{3}+\dfrac{4}{37}+\dfrac{5}{111}+\dfrac{20}{111}\)
\(=\dfrac{74+12+5+20}{111}\)
\(=\dfrac{111}{111}\)
\(=1\)
\(\dfrac{2}{3}+\dfrac{4}{37}+\dfrac{5}{111}+\dfrac{260}{1443}\)
\(=\dfrac{2}{3}+\dfrac{4}{37}+\dfrac{5}{111}+\dfrac{20}{111}\)
\(=\dfrac{74+12+5+20}{111}\)
\(=\dfrac{111}{111}\)
\(=1\)
Tính:
1) 1996 . 1037 - 1996 . 37
2) (260 - 13) : 13
3) ( 23 . 35 + 35 . 37 ) : 60
Cho biết 37 . 3 = 111. Hãy tính nhanh 37 . 12
Tính hợp lý
a)(100+42)x42+(200-58)x58
b)(1998:18-1443:13)x(16996-1110:30x305)
c)\(5\frac{3}{5}+1,75+6\frac{1}{8}+4\frac{1}{4}+3,875+3,4\)
1) Cho
1/M=1/1+2+3+1/1+2+3+4+..+1/1+2+3+..+59
CMR M>2/3
2)Tính:
P=(1-1/111)(1-2/111)...(1-2009/111)
Tính : a) C = -1 + 3 - 5 + 7 - 9 + ... - 2009 + 2011 - 2013
b) D = 2 - 4 + 6 - 8 + ... + 2006 - 2008 + 2010 - 2012
c) G = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... - 111 - 112 + 113 + 114 + 115
Tính hợp lý:
a. A=-1+3-5+7-9+...+2011-2013
b. B=2-4+6-8+...( có 2017 số hạng)
c. C=-1-2+3+4-5-6+7+8-...+111+112-113-114+115
tính hợp lí:
a)\(\left(4\dfrac{5}{37}-3\dfrac{4}{5}+8\dfrac{15}{29}\right)-\left(3\dfrac{5}{37}-6\dfrac{14}{29}\right)\)
b) \(60\dfrac{7}{13}+50\dfrac{8}{13}-11\dfrac{2}{13}\)
c) \(\dfrac{\dfrac{2}{3}+\dfrac{2}{7}-\dfrac{1}{14}}{-1-\dfrac{3}{7}+\dfrac{3}{28}}\)
khi chia stn a cho 148 ta được số dư là 111. hỏi a có chia hết cho 37 không
1. 210 x 13 + 210 x 65/ 28 x 104
2. ( 1+2 + 3 +.............+ 100) x (12 + 22+ 32+............+ 102) x ( 65 x 111- 13x 15 x 37)
3. 11x322 x 37 - 915 / 2 x 314)2
Help!!!!!!!!!!!!!!