1) Tính nhanh :
\(a,\frac{2006.2004-9}{1995+2004.2005}\) \(c,\frac{2015.2014-1}{2013.2015+2014}\)
\(b,\frac{2011.2010-1}{2009.2011+2010}\)\(d,\frac{18.123+9.335.2+6.396}{1+4+7+10+.....+55+58}\)
Mọi người giải giúp mình với !
Thực hiện phép tính bằng cách hợp lý:
A= \(\frac{2011.2010-1}{2009.2011+2010}\)
B= (\(\frac{1}{2009}+\frac{13}{2010}+\frac{135}{2011}\)).(\(\frac{1}{3}-\frac{1}{5}-\frac{2}{15}\))
tính nhanh
\(\frac{2015.2014-1}{2013.2015+2014}\)
\(\frac{2015.2014-1}{2013.2015+2014}\)
\(=\frac{2015.2013+2015-1}{2013.2015+2014}\)
\(=\frac{2015.2013+2014}{2013.2015+2014}\)
\(=1\)
Tham khảo nhé~
\(\frac{2015\cdot2014-1}{2013\cdot2015+2014}\)
\(=\frac{2015-1}{2014}\)
\(=\frac{2014}{2014}\)
\(=1\)
\(\text{Chúc bạn học tốt ! }\)
A = \(\frac{2011.2010-1}{2009.2011+2010}\)
Tính A
Câu hỏi của Mun - Toán lớp 5 - Học toán với OnlineMath
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A = 2011.2010−12009.2011+2010
=> \(\frac{2011.2009+2011-1}{2009.2011+2010}\) = \(\frac{2011.2009+2010}{2009.2011+2010}=1\)
=> A = 1
t i c k nhé!! 354543564576856925253456456545756756887676976
\(A=\frac{2011.2010-1}{2009.2011+2010}\)
\(A=1\)
nha bạn ^_^
Nguyễn Kim ChiĐúng,Đúng,Đúngem xin lỗi
Tính bằng cách hợp lý :
a)\(\frac{2011.2010-1}{2009.2011+2010}\);
b)10,11+11,12+12,13+13,14+...+97,98+98,99+99,100
????????????????????????????????????????????????/
Tính:
A=\(\frac{7}{3}\).\(\frac{11}{16}\)+\(\frac{10}{3}\).\(\frac{7}{16}\)-\(\frac{7}{6}\).\(\frac{5}{8}\)
B=1+2-3-4+5+6-7-8+.....+2005+2006-2007-2008+2009+2010
C=(1-\(\frac{1}{4}\))(1-\(\frac{1}{9}\))(1-\(\frac{1}{16}\))......(1-\(\frac{1}{100000}\))
D=\(\frac{17\frac{3}{4}.\frac{17}{5}+3\frac{2}{5}.82\frac{1}{4}}{2.34-3.17}\)
E=\(\frac{\frac{2008}{2011}+\frac{2009}{2010}+\frac{2010}{2009}+\frac{2011}{2008}+\frac{2012}{503}}{\frac{1}{2011}+\frac{1}{2010}+\frac{1}{2009}+\frac{1}{2008}}\)
F=(2-\(\frac{2}{1.3}\))+(2-\(\frac{2}{3.5}\))+(2-\(\frac{2}{5.7}\))+.....+(2-\(\frac{2}{2009.2011}\))
Tính nhanh
\(\frac{2014+\frac{2013}{2}+\frac{2012}{3}+\frac{2011}{4}+\frac{2010}{5}+...+\frac{2}{2013}+\frac{1}{2014}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2012}+\frac{1}{2013}+\frac{1}{2014}}\)
Giải tự luận hộ mình nha!!!!!!!! Mình cảm ơn!!!
Đặt phân thức trên là D
=> D=(1+1+1+1+...+1+2013/2+2012/3+...+2/2013+1/2014)/(1/2+1/3+1/4+...+1/2014)
=> D=(1+2013/2+1+2012/3+1+2011/4+...+1+2/2013+1+1/2014+1)/(1/2+1/3+1/4+1/5+...+1/2014)
=> D=(2015/2+2015/3+2015/4+...+2015/2013+2015/2014+1)/(1/2+1/3+1/4+...+1/2014)
=> D=[2015*(1/2+1/3+1/4+1/5+....+1/2014)]/(1/2+1/3+1/4+1/5+...+1/2014)
=> D=2015
UwU
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đùa thôi đáp án: 2015 nha bn
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À quên nhớ FOLOW CHO TUI NHA!
Tính nhanh: \(B=\left(\frac{0.4-\frac{2}{9}+\frac{2}{11}}{1.4-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-0.25+\frac{1}{5}}{1\frac{1}{6}-0.875+0.7}\right):\frac{2014}{2015}\)
1 Tính nhanh
a) S= 1-2+3-4+5-6+...+2001-2002+2003
b) \(A=\frac{12}{3.5}+\frac{12}{5.7}+...+\frac{12}{2013.2015}\)
a/
S = 1-2+3-4+5-6+...+2001-2002+2003
= [-1] +[-1] +...+[-1] +2003
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1001 số -1
= -1001 +2003 = 1002
b/
A = \(6.\left(\frac{2}{3.5}+\frac{2}{5.7}+...+\frac{2}{2013.2015}\right)=6.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{2013}-\frac{1}{2015}\right)=6.\left(\frac{1}{3}-\frac{1}{2015}\right)=\frac{6.2012}{6045}=\frac{4024}{2015}\)
Tính nhanh : \(A=\frac{2013.2015-2014}{2.1975.1930+30.1975+3860}.\frac{1975.1945+1930}{2013.2013+2012}\)