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\(\frac{5}{1.6}\)+ \(\frac{5}{6.11}\)+ .........+\(\frac{5}{501.506}\)
=\(\frac{1}{1.6}+\frac{1}{6.11}+.....+\frac{1}{501.506}\)
=\(\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+......+\frac{1}{501}-\frac{1}{506}\)
=\(\frac{1}{1}-\frac{1}{506}\)
= tự tính nha
thu tu tu be den lon la 5/6 ;; 8 /9 ;;; 17/18
bai 2
3/5 <1 ;;;;;;;;; 6/4 >1 ;;;;;;; 1 > 7/8
*** minh nah
1 .
Ta có :8/9 = 16/18
5/6 = 15/18
Vì : 15/18 < 16/18 < 17/18
=> 5/6 < 8/9 < 17/18
2 .
3/5 < 1
9/4 > 1
1> 7/8
k nhé tớ k lại cho
hihihiihih ^_^ ~ hihihihihih
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{9}{5}\times\frac{15}{17}+\frac{8}{5}\times\frac{15}{17}\)
\(=\frac{15}{17}\times\left(\frac{9}{5}+\frac{8}{5}\right)\)
\(=\frac{15}{17}\times\frac{17}{5}\)
\(=3\)
h minh nhen
\(\frac{8}{9}-\frac{5}{6}=\frac{16}{18}-\frac{15}{18}=\frac{1}{18}\)
\(\frac{90}{108}-\frac{40}{72}=\frac{5}{6}-\frac{5}{9}=\frac{15}{18}-\frac{10}{18}=\frac{5}{18}\)
\(\frac{15}{17}-\frac{11}{13}=\frac{195}{221}-\frac{187}{221}=\frac{8}{221}\)
\(\frac{8}{9}-\frac{5}{6}=\frac{16}{18}-\frac{15}{18}=\frac{1}{18}\)
\(\frac{90}{108}-\frac{40}{72}=\frac{30}{36}-\frac{20}{36}=\frac{10}{36}=\frac{5}{18}\)
a,(11/15+4/15)+(5/7+2/7)
=1+1
=2
b,5/9x(1/2+6/4)
=5/9x2
=10/9
c,1/2:(7/8+9/8)
=1/2:2
=1
d,(17/10-7/10)+1/2
=1+1/2
=3/2
a) \(\frac{11}{15}+\frac{5}{7}+\frac{2}{7}+\frac{4}{15}=\left(\frac{11}{15}+\frac{4}{15}\right)+\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=2\)
b) \(\frac{5}{9}\times\frac{1}{2}\times\frac{5}{9}\times\frac{6}{4}=\frac{25}{81}\times\frac{3}{4}=\frac{25}{108}\)
c) \(\frac{7}{8}\div\frac{1}{2}+\frac{9}{8}\div\frac{1}{2}=\left(\frac{7}{8}+\frac{9}{8}\right)\div\frac{1}{2}\)
\(=2\div\frac{1}{2}=4\)
d) \(\frac{17}{10}+\frac{1}{2}-\frac{7}{10}=\left(\frac{17}{10}-\frac{7}{10}\right)+\frac{1}{2}\)
\(=1+\frac{1}{2}=\frac{3}{2}\)
a) \(\frac{11}{15}+\frac{5}{7}+\frac{2}{7}+\frac{4}{15}\)
\(=\left(\frac{11}{15}+\frac{4}{15}\right)+\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=1+1\)
\(=2\)
b) \(\frac{5}{9}.\frac{1}{2}.\frac{5}{9}.\frac{6}{4}\)
\(=\left(\frac{5}{9}\right)^2\left(\frac{1}{2}.\frac{6}{4}\right)\)
\(=\frac{25}{81}.\frac{3}{4}\)
\(=\frac{25}{108}\)
c) \(\frac{7}{8}:\frac{1}{2}+\frac{9}{8}:\frac{1}{2}\)
\(=\frac{7}{8}.2+\frac{9}{8}.2\)
\(=2\left(\frac{7}{8}+\frac{9}{8}\right)\)
\(=2.\frac{16}{8}\)
\(=2.2\)
\(=4\)
d) \(\frac{17}{10}+\frac{1}{2}-\frac{7}{10}\)
\(=\left(\frac{17}{10}-\frac{7}{10}\right)+\frac{1}{2}\)
\(=1+\frac{1}{2}\)
\(=\frac{2}{2}+\frac{1}{2}\)
\(=\frac{3}{2}\)
a) \(\frac{5}{6};\frac{8}{9};\frac{17}{18}\)
b) \(\frac{1}{2};\frac{5}{8};\frac{3}{4}\)
~HT~
a ) Ta có :
\(\frac{8}{9}=\frac{8\times2}{9\times2}=\frac{16}{18}\)
\(\frac{5}{6}=\frac{5\times3}{6\times3}=\frac{15}{18}\)
Ta thấy : \(15< 16< 17\)
\(\Rightarrow\)\(\frac{15}{18}< \frac{16}{18}< \frac{17}{18}\)hay \(\frac{5}{6}< \frac{8}{9}< \frac{17}{18}\)
b ) Ta có :
\(\frac{1}{2}=\frac{1\times4}{2\times4}=\frac{4}{8}\)
\(\frac{3}{4}=\frac{3\times2}{4\times2}=\frac{6}{8}\)
Ta thấy :\(4< 5< 6\)
\(\Rightarrow\)\(\frac{4}{8}< \frac{5}{8}< \frac{6}{8}\)hay \(\frac{1}{2}< \frac{5}{8}< \frac{3}{4}\)
\(6\frac{5}{9}-\frac{8}{17}-\frac{3}{17}-\frac{6}{17}\)
\(=\frac{59}{9}-\left(\frac{8}{17}+\frac{3}{17}+\frac{6}{17}\right)\)
\(=\frac{59}{9}-\frac{17}{17}\)
\(=\frac{50}{9}\)