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Bài 1 :
\(\frac{22}{55}=\frac{22:11}{55:11}=\frac{2}{5}\)
\(\frac{63}{81}=\frac{63:9}{81:9}=\frac{7}{9}\)
Bài 2 :
\(\frac{3}{16}=\frac{3\times24\times56}{16\times24\times56}=\frac{4032}{21504}\)
\(\frac{5}{24}=\frac{5\times16\times56}{24\times16\times56}=\frac{4480}{21504}\)
\(\frac{21}{56}=\frac{21\times24\times16}{56\times24\times16}=\frac{8064}{21504}\)
Học tốt # ^-<
\(\frac{93}{42}=\frac{93:3}{42:3}=\frac{31}{14}\)
\(\frac{86}{24}=\frac{86:2}{24:2}=\frac{43}{12}\)
\(\frac{124}{80}=\frac{124:4}{80:4}=\frac{31}{20}\)
1
\(\frac{2}{12;}=\frac{1}{6}\)
\(\frac{42}{63}=\frac{1}{2}\)
\(\frac{5}{60}=\frac{1}{12}\)
2.
\(\frac{3}{4}=\frac{15}{12}\) số còn lại giữ nguyên
\(\frac{20}{5}=\frac{120}{30};\frac{7}{6}=\frac{35}{30}\)
\(\frac{1}{6}\) \(\frac{7}{9}\) \(\frac{1}{12}\)
\(\frac{5}{12}và\frac{9}{12}\) \(\frac{120}{30}và\frac{35}{30}\)
\(\frac{54}{60}-\frac{20}{12}=\frac{-46}{60}=\frac{-23}{30}\)
\(\frac{70}{63}+\frac{23}{12}=\frac{109}{36}\)
Bài 2
\(\frac{54}{62}=\frac{1134}{1302}\)
\(\frac{12}{21}=\frac{744}{1302}\)
k mk nha !!
\(\frac{54}{60}-\frac{20}{12}=\frac{54}{60}-\frac{20\cdot5}{12\cdot5_{ }}=\frac{54}{60}-\frac{100}{60}\)
\(=\frac{-23}{30}\)
Tương tự như thế nhé
\(1.a,\frac{5}{7}=\frac{5.9}{7.9}=\frac{45}{63};\frac{4}{9}=\frac{4.7}{9.7}=\frac{28}{63}.\)
\(b,\frac{7}{15},\frac{5}{3}=\frac{5.5}{3.5}=\frac{25}{15}\)
\(c,\frac{11}{12}=\frac{11.4}{12.4}=\frac{44}{48};\frac{7}{48}\)
\(d,\frac{3}{2}=\frac{3.3}{2.3}=\frac{9}{6};\frac{2}{3}=\frac{2.2}{3.2}=\frac{4}{6}\)
\(e,\frac{1}{3}=\frac{1.4}{3.4}=\frac{4}{12};\frac{5}{4}=\frac{5.3}{4.3}=\frac{15}{12};\frac{10}{12}\)
1)\(\frac{7}{8}>\frac{6}{7}>\frac{4}{5}>\frac{1}{2}>\frac{5}{16}\)
2)
a.\(\frac{3}{7}\)và\(\frac{5}{16}\)
Ta có :\(\frac{3}{7}=\frac{3\times5}{7\times5}=\frac{15}{35}\) \(\frac{5}{16}=\frac{5\times3}{16\times3}=\frac{15}{48}\)
\(\frac{15}{35}>\frac{15}{48}\Rightarrow\frac{3}{7}>\frac{5}{16}\)
b.làm tương tự như câu a nhé
3636/4545+x=4848/1515
x=4848/1515-3636/4545
x=14544/4545-3636/4545
x=10908/4545
3535/5050-x=8/25
x=3535/5050-1616/5050
x=1919/5050
\(\frac{80}{92}\)=\(\frac{80:4}{92:4}\)=\(\frac{20}{23}\)
\(\frac{86}{28}\)=\(\frac{86:4}{28:4}\)=\(\frac{43}{14}\)
k cho mình nhé