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\(\frac{\frac{4}{2010}+\frac{4}{2011}-\frac{4}{2012}}{\frac{5}{2010}+\frac{5}{2011}-\frac{5}{2012}}-\frac{\frac{1}{123}-\frac{1}{19}+\frac{1}{37}-\frac{1}{5}}{-\frac{5}{123}+\frac{5}{19}-\frac{5}{37}+1}\)= ?
bài 1 :a) Tính M:\(\frac{\frac{7}{2012}+\frac{7}{9}-\frac{1}{4}}{\frac{5}{9}-\frac{3}{2012}-\frac{1}{2}}\)
b) So sánh A và B biết A =\(\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2010}\);;; B =\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+....+\frac{1}{17}\)
1/ Chứng tỏ rằng frac{1}{1cdot2}+frac{1}{2cdot3}+frac{1}{3cdot4}+...+frac{1}{99cdot100}12/ Chứng tỏ rằng Bfrac{1}{4}+frac{1}{5}+frac{1}{6}+...+frac{1}{19}13/ Rút gọn biểu thức A1+frac{1}{2}+frac{1}{2^2}+frac{1}{2^3}+...+frac{1}{2^{2012}}4/ Tính nhanhfrac{frac{4}{2010}+frac{4}{2011}-frac{4}{2012}}{frac{5}{2010}+frac{5}{2011}-frac{5}{2012}}-frac{frac{1}{123}-frac{1}{19}+frac{1}{371}-frac{1}{5}}{-frac{5}{123}+frac{5}{19}-frac{5}{371}+1} GIÚP ĐƯỢC CÂU NÀO THÌ GIÚP NHÉ, MÌNH TICK CHO
Đọc tiếp
1/ Chứng tỏ rằng \(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+...+\frac{1}{99\cdot100}<1\)
2/ Chứng tỏ rằng \(B=\frac{1}{4}+\frac{1}{5}+\frac{1}{6}+...+\frac{1}{19}<1\)
3/ Rút gọn biểu thức \(A=1+\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{2012}}\)
4/ Tính nhanh\(\frac{\frac{4}{2010}+\frac{4}{2011}-\frac{4}{2012}}{\frac{5}{2010}+\frac{5}{2011}-\frac{5}{2012}}-\frac{\frac{1}{123}-\frac{1}{19}+\frac{1}{371}-\frac{1}{5}}{-\frac{5}{123}+\frac{5}{19}-\frac{5}{371}+1}\)
GIÚP ĐƯỢC CÂU NÀO THÌ GIÚP NHÉ, MÌNH TICK CHO
tính M
M = \(\frac{\frac{7}{2012}+\frac{7}{9}-\frac{1}{4}}{\frac{5}{9}-\frac{3}{2012}-\frac{1}{2}}\)
so sánh A và B biết
A = \(\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2010}\)
B = \(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{17}\)
Bài 3 : a) Tính
\(\frac{\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\right)\cdot230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{10}+\frac{10}{3}\right):\left(12\frac{1}{3}-14\frac{2}{7}\right)}\)
b) Tính :
\(P=\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2012}}{\frac{2011}{1}+\frac{2010}{2}+\frac{2009}{3}+\frac{1}{2011}}\)
tính nhanh
\(P=\frac{\frac{2}{3}-\frac{1}{4}+\frac{5}{7}}{\frac{5}{12}+1-\frac{7}{11}}\)
thực hiện phép tính :
1-2+3-4+5-6+...+2011-2012
bài 1 So sánha)Afrac{3}{8^3}+frac{7}{8^4} ; Bfrac{7}{8^3}+frac{3}{8^4}b)Afrac{10^{1992}+1}{10^{1991}+1};Bfrac{10^{1993}+1}{10^{1992}+1}c)Afrac{10^7+5}{10^4-8};Bfrac{10^8+6}{10^8-7}d)Afrac{1+5+5^2+...+5^9}{1+5+5^2+...+5^8};Bfrac{1+3+3^2+...+3^9}{1+3+3^2+...+3^8}e)Afrac{2011}{2012}+frac{2012}{2013};Bfrac{2011+2012}{2012+2013}
Đọc tiếp
bài 1 So sánh
a)\(A=\frac{3}{8^3}+\frac{7}{8^4}\) ; \(B=\frac{7}{8^3}+\frac{3}{8^4}\)
b)\(A=\frac{10^{1992}+1}{10^{1991}+1};B=\frac{10^{1993}+1}{10^{1992}+1}\)
c)\(A=\frac{10^7+5}{10^4-8};B=\frac{10^8+6}{10^8-7}\)
d)\(A=\frac{1+5+5^2+...+5^9}{1+5+5^2+...+5^8};B=\frac{1+3+3^2+...+3^9}{1+3+3^2+...+3^8}\)
e)\(A=\frac{2011}{2012}+\frac{2012}{2013};B=\frac{2011+2012}{2012+2013}\)
bai 1:tính nhanh : P=\(\frac{\frac{2}{3}-\frac{1}{4}+\frac{5}{11}}{\frac{5}{12}+1-\frac{7}{11}}\)
Bai 2:Thực hiện phép tính: 1-2+3-4+5-6+...+2011-2012
Bai 3:so sánh:A=\(\frac{2011+2012}{2012+2013}\)
B=\(\frac{2011}{2012}+\frac{2012}{2013}\)
bai4:so sánh:A=\(\frac{20^{10}+1}{20^{10}-1}\)
B=\(\frac{20^{10}-1}{20^{10}-3}\)
1.So sánh A và B:
\(A=\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2010}\)và \(B=\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+..........+\frac{1}{17}\)