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4 tháng 2 2017
\(\frac{3}{15}\)= \(\frac{3:3}{15:3}\) = \(\frac{1}{5}\)
\(\frac{33}{44}\)= \(\frac{33:11}{44:11}\)= \(\frac{3}{4}\)
\(\frac{2}{8}\)= \(\frac{2:2}{8:2}\)= \(\frac{1}{4}\)
\(\frac{1}{5}\)= \(\frac{1\times4}{5\times4}\)= \(\frac{4}{20}\)
\(\frac{3}{4}\)=\(\frac{3\times5}{4\times5}\)= \(\frac{15}{20}\)
\(\frac{1}{4}\)= \(\frac{1\times5}{4\times5}\)= \(\frac{5}{20}\)
\(\frac{9}{12}\)=\(\frac{9:3}{12:3}\) = \(\frac{3}{4}\)
\(\frac{24}{36}\)=\(\frac{24:12}{36:12}\)= \(\frac{2}{3}\)
\(\frac{3}{8}\)= \(\frac{3:1}{8:1}\)= \(\frac{3}{8}\)
\(\frac{3}{4}\)=\(\frac{3\times6}{4\times6}\)= \(\frac{18}{24}\)
\(\frac{2}{3}\)=\(\frac{2\times8}{3\times8}\)=\(\frac{16}{24}\)
\(\frac{3}{8}\)= \(\frac{3\times3}{8\times3}\)=\(\frac{9}{24}\)
4 tháng 2 2017
3/15= 1/5; 33/44=3/4; 2/8= 1/4
1/5= 1x 4/ 5x4= 4/20; 3/4= 3x 5/ 4x 5= 15/20; 1/4= 1x 5/ 4x 5= 5/20
9/12= 3/4; 24/36= 2/3; 3/8 không rút gọn được
3/4= 3x 6/ 4x6= 18/24; 2/3= 2x 8/ 3x 8= 16/24; 3/8= 3x 3/ 8x 3= 9/24
12 tháng 2 2017
\(\frac{3}{5}=\frac{24}{40};\frac{3}{8}=\frac{15}{40};\frac{3}{10}=\frac{12}{40};\frac{3}{2}=\frac{60}{40}\)
12 tháng 2 2017
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
MH
23 tháng 1 2016
a. \(\frac{34}{50}=\frac{2\times17}{2\times25}=\frac{17}{25}\); \(\frac{48}{68}=\frac{4\times12}{4\times17}=\frac{12}{17}\); \(\frac{1313}{2323}=\frac{101\times13}{101\times23}=\frac{13}{23}\); \(\frac{515151}{636363}=\frac{10101\times51}{10101\times63}=\frac{51}{63}\)
b. +) \(\frac{3}{15}=\frac{3}{3\times5}=\frac{1}{5}\); \(\frac{33}{44}=\frac{3\times11}{4\times11}=\frac{3}{4}\); \(\frac{2}{8}=\frac{2}{2\times4}=\frac{1}{4}\)
Mẫu chung: 20
\(\frac{1}{5}=\frac{1\times4}{5\times4}=\frac{4}{20}\); \(\frac{3}{4}=\frac{3\times5}{4\times5}=\frac{15}{20}\); \(\frac{1}{4}=\frac{1\times5}{4\times5}=\frac{5}{20}\)
+) \(\frac{9}{12}=\frac{3\times3}{4\times3}=\frac{3}{4}\); \(\frac{24}{36}=\frac{12\times2}{12\times3}=\frac{2}{3}\); \(\frac{3}{8}=\frac{3}{8}\)
Mẫu chung : 24
\(\frac{3}{4}=\frac{3\times6}{4\times6}=\frac{18}{24}\); \(\frac{2}{3}=\frac{2\times8}{3\times8}=\frac{16}{24}\); \(\frac{3}{8}=\frac{3\times3}{8\times3}=\frac{9}{24}\).
20 tháng 2 2022
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
10 tháng 2 2022
bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
DM
0
\(\frac{3}{15};\frac{33}{44};\frac{2}{8}\left(MSC:1320\right)\)
\(\frac{3}{15}=\frac{3\times88}{15\times88}=\frac{264}{1320}\)
\(\frac{33}{44}=\frac{33\times30}{44\times30}=\frac{990}{1320}\)
\(\frac{2}{8}=\frac{2\times165}{8\times165}=\frac{330}{1320}\)
\(\Leftrightarrow\frac{264}{1320};\frac{990}{1320};\frac{330}{1320}\)