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a)15/8:9/8/7/8;3/8
b)3/5;7/15;4/15;8/45
c)9/4;47/10;4/5;3/8
a) \(\frac{3}{8},\frac{15}{8},\frac{9}{8},\frac{7}{8}\)
Từ lớn -> bé:
=>\(\frac{15}{8},\frac{9}{8},\frac{7}{8},\frac{3}{8}\)
b) \(\frac{4}{15},\frac{3}{5},\frac{8}{45},\frac{7}{15}=\frac{12}{45},\frac{27}{45},\frac{8}{45},\frac{21}{45}\)
Từ lớn -> bé:
=> \(\frac{3}{5},\frac{7}{15},\frac{4}{15},\frac{8}{45}\)
c) \(\frac{3}{8},\frac{4}{5},\frac{47}{40},\frac{9}{4}=\frac{15}{40},\frac{32}{40},\frac{47}{40},\frac{90}{40}\)
Từ lớn -> bé:
=>\(\frac{9}{4},\frac{47}{40},\frac{4}{5},\frac{3}{8}\)
a)2/3, 4/5,11/15
b)5/6,5/4,7/9,21/5
a) 9/7,3/2,17/14
b)3/2,5/4,7/10,3/5
lấy mt ra,quy đồng rùi sắp xếp như thường,có thek thui!!!!!!!!!!!!!!!!!!!!
\(0,5=\dfrac{1}{2};0,75=\dfrac{3}{4}\)
\(\dfrac{1}{2}=\dfrac{15}{30};\dfrac{1}{3}=\dfrac{10}{30};\dfrac{3}{5}=\dfrac{18}{30};1=\dfrac{30}{30};0,75=\dfrac{22.5}{30};\dfrac{5}{4}=\dfrac{37.5}{30}\)
mà 10<15<18<22,5<30<37,5
nên \(\dfrac{10}{30}< \dfrac{15}{30}< \dfrac{18}{30}< \dfrac{22.5}{30}< \dfrac{30}{30}< \dfrac{37.5}{30}\)
=>\(\dfrac{1}{3}< 0,5< \dfrac{3}{5}< 0,75< 1< \dfrac{5}{4}\)
\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
\(1\frac{1}{2};1\frac{1}{3};1\frac{1}{4};1\frac{1}{5};1\frac{1}{6};1\frac{1}{7};1\frac{1}{8}\)\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
Vì \(\frac{1}{2}>\frac{1}{3}>\frac{1}{4}>\frac{1}{5}>\frac{1}{6}>\frac{1}{7}>\frac{1}{8}\)
=> \(1\frac{1}{2}>1\frac{1}{3}>1\frac{1}{4}>1\frac{1}{5}>1\frac{1}{6}>1\frac{1}{7}>1\frac{1}{8}\)
Hay \(\frac{3}{2}>\frac{4}{3}>\frac{5}{4}>\frac{6}{5}>\frac{7}{6}>\frac{8}{7}>\frac{9}{8}\)
\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
\(\dfrac{1}{2}< \dfrac{1+1}{2+1}=\dfrac{2}{3}\)
\(\dfrac{2}{3}< \dfrac{2+1}{3+1}=\dfrac{3}{4}\)
\(\dfrac{3}{4}< \dfrac{3+1}{4+1}=\dfrac{4}{5}\)
\(\dfrac{4}{5}< \dfrac{4+1}{5+1}=\dfrac{5}{6}\)
\(\dfrac{5}{6}< \dfrac{5+1}{6+1}=\dfrac{6}{7}\)
\(\)Vậy \(\dfrac{1}{2}< \dfrac{2}{3}< \dfrac{3}{4}< \dfrac{4}{5}< \dfrac{5}{6}< \dfrac{6}{7}\)
Bài làm
Ta có:
\(a=\frac{2}{3}+0,75\) \(b=\frac{4}{7}+2,5\) \(c=0,75:\frac{4}{7}\)
\(a=\frac{2}{3}+\frac{3}{4}\) \(b=\frac{4}{7}+\frac{5}{2}\) \(c=\frac{3}{4}:\frac{4}{7}\)
\(a=\frac{8}{12}+\frac{9}{12}\) \(b=\frac{8}{14}+\frac{35}{14}\) \(c=\frac{3}{4}x\frac{7}{4}\)
\(a=\frac{17}{12}\) \(b=\frac{43}{14}\) \(c=\frac{21}{16}\)
Lại có:
\(a=\frac{17}{12}\Rightarrow a=\frac{476}{336}\)
\(b=\frac{43}{14}\Rightarrow b=\frac{1032}{336}\)
\(c=\frac{21}{16}\Rightarrow c=\frac{441}{336}\)
Vì \(\frac{1032}{336}>\frac{476}{336}>\frac{441}{336}\)
Hay \(b=\frac{4}{7}+2,5>a=\frac{2}{3}+0,75>c=0,75:4,7\)
Vậy sắp xếp theo thứ tự từ lớn đến bé là : b; a; c.
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cho mk hỏi lớp 5 đã hk số thập phân chưa