Mik làm từ trên xuống đưới nha

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HT

dap an la 
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Làm 1 câu

10/3...>...1/3

Mấy câu ssu tự quy đồng hay gì gì đấy!

10/3.>..1/3.     10/6.>..3/8.     17/4.>..5/6.    1/3..<.5/9     5/8.<..7/5    3/4..<.15/6      10/9.>..10/11   7/8..<.7/2       15/9.>..3/8  15/7.>..15/8      16/5.>..16/7    25/11..<.1

Bài 1:

\(\frac14+\frac23=\frac{3}{12}+\frac{8}{12}=\frac{3+8}{12}=\frac{11}{12}\)

\(\frac27+\frac23=\frac{6}{21}+\frac{14}{21}=\frac{6+14}{21}=\frac{20}{21}\)

\(\frac25+\frac13=\frac{6}{15}+\frac{5}{15}=\frac{6+5}{15}=\frac{11}{15}\)

\(\frac23+\frac12=\frac46+\frac36=\frac{4+3}{6}=\frac76\)

\(\frac13+\frac35=\frac{5}{15}+\frac{9}{15}=\frac{5+9}{15}=\frac{14}{15}\)
\(\frac45+\frac13=\frac{12}{15}+\frac{5}{15}=\frac{12+5}{15}=\frac{17}{15}\)

\(\frac18+\frac34=\frac18+\frac68=\frac{1+6}{8}=\frac78\)

\(\frac{1}{36}+\frac{5}{12}=\frac{1}{36}+\frac{15}{36}=\frac{1+15}{36}=\frac{16}{36}=\frac49\)

\(\frac13+\frac16+\frac{1}{18}=\frac{6}{18}+\frac{3}{18}+\frac{1}{18}=\frac{6+3+1}{18}=\frac{10}{18}=\frac59\)

Bài 2:

\(\frac{15}{16}-\frac{3}{16}=\frac{15-3}{16}=\frac{12}{16}=\frac34\)

\(\frac{17}{18}-\frac56=\frac{17}{18}-\frac{15}{18}=\frac{17-15}{18}=\frac{2}{18}=\frac19\)

\(\frac34-\frac49=\frac{27}{36}-\frac{16}{36}=\frac{27-16}{36}=\frac{11}{36}\)

\(\frac12-\frac25=\frac{5}{10}-\frac{4}{10}=\frac{5-4}{10}=\frac{1}{10}\)

\(\frac56-\frac{3}{10}=\frac{25}{30}-\frac{9}{30}=\frac{25-9}{30}=\frac{16}{30}=\frac{8}{15}\)

\(3-\frac13=\frac93-\frac13=\frac{9-1}{3}=\frac83\)

\(\frac45-\frac{1}{10}=\frac{8}{10}-\frac{1}{10}=\frac{7}{10}\)

\(\frac52-1=\frac{5-2}{2}=\frac32\)

\(\frac58-\frac25=\frac{25}{40}-\frac{16}{40}=\frac{25-16}{40}=\frac{9}{40}\)

\(5-\frac{13}{17}=\frac{5}{1}-\frac{13}{17}=\frac{85}{17}-\frac{13}{17}=\frac{72}{17}\)

\(\frac{2}{5}-\frac{1}{7}=\frac{14}{35}-\frac{5}{35}=\frac{9}{35}\)

\(\frac{4}{9}-\frac{2}{9}=\frac{4-2}{9}=\frac{2}{9}\)

\(\frac{5}{4}-\frac{1}{3}=\frac{15}{12}-\frac{4}{12}=\frac{11}{12}\)

\(\frac{5}{2}-\frac{1}{4}-\frac{2}{3}=\frac{30}{12}-\frac{3}{12}-\frac{8}{12}=\frac{19}{12}\)

\(\frac{4}{3}-\frac{2}{5}+\frac{1}{2}=\frac{40}{30}-\frac{12}{30}+\frac{15}{30}=\frac{40-12+15}{30}=\frac{53}{30}\)

tk cho mk,mk đang bị trừ điểm

\(a,\frac{8}{9}-\frac{1}{3}\div\frac{1}{2}\)

\(=\frac{8}{9}-\frac{1}{3}\times\frac{1}{2}\)

\(=\frac{8}{9}-\frac{1}{6}\)

\(=\frac{13}{18}\)

\(b,\left(\frac{3}{10}+\frac{4}{5}\times\frac{1}{2}\right)\div\left(\frac{17}{9}-\frac{4}{3}\right)\)

\(=\left(\frac{3}{10}+\frac{2}{5}\right)\div\frac{5}{9}\)

\(=\frac{7}{10}\div\frac{5}{9}=\frac{63}{50}\)

2, Chiều dài mảnh đất là:

\(\frac{25}{4}\div\frac{5}{4}=5\left(m\right)\)

Chu vi mảnh đất là:

\(\left(5+\frac{5}{4}\right)\times2=\frac{25}{2}\left(m\right)\)

                                      \(Đs:...\)

Bài 1:

\(a,\frac{8}{9}-\frac{1}{3}:\frac{1}{2}\)

=\(\frac{8}{9}-\frac{2}{3}\)

=\(\frac{2}{9}\)

\(b,\left(\frac{3}{10}+\frac{4}{5}x\frac{1}{2}\right):\left(\frac{17}{9}-\frac{4}{3}\right)\)

=\(\left(\frac{3}{10}+\frac{4}{10}\right):\frac{5}{9}\)

=\(\frac{7}{10}:\frac{5}{9}\)

=\(\frac{63}{50}\)

Bài 2:

Chiều dài của mảnh đất hình chữ nhật đó là:

          \(\frac{25}{4}:\frac{5}{4}=5\left(m^2\right)\)

Chu vi của mảnh đất hình chữ nhật đó là:

            \(\left(\frac{5}{4}+5\right)x2=\frac{25}{2}\left(m\right)\)

                                      Đáp số:\(\frac{25}{2} \left(m\right)\)

5/7 < 4/3

7/2 > 4/79

2/5 < 6/10

15/23 < 1

1/4 = 3/12

27/9 > 2

27/36 > 2/9

14/15 < 1

7/6 > 7/9

51/17 = 3/1

tk mình nha bạn, mình kp vs bạn r đó. .. ^^

5/7 < 4/3 7/2 > 4/79 2/5 < 6/10 15/23 < 1 1/4 = 3/12 27/9 > 2 27/36 > 2/9 14/15 < 1 7/6 > 7/9 51/17 = 3/1