Rút gọn các phân số sau:
a ) 16. ( − 5 ) 20.12 b ) ( − 35 ) .3.10 14.15.6 c ) 15.39 − 15 57
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\(\dfrac{-63}{72}=\dfrac{-7}{8}\)
\(\dfrac{20}{-140}=\dfrac{-1}{7}\)
\(\dfrac{3.10}{5.24}=\dfrac{30}{120}=\dfrac{1}{4}\)
\(\dfrac{3.7.11}{22.9}=\dfrac{231}{198}=\dfrac{7}{6}\)
\(\dfrac{8.5-8.2}{16}=\dfrac{24}{16}=\dfrac{3}{2}\)
\(\dfrac{11.4-11}{2-13}=\dfrac{33}{-11}=-3\)
a)
\(\dfrac{6}{12}=\dfrac{6:6}{12:6}=\dfrac{1}{2}\)
\(\Rightarrow\dfrac{1}{2}=\dfrac{1\times2}{2\times2}=\dfrac{2}{4}\)
Mà \(\dfrac{2}{4}< \dfrac{3}{4}\)
Vậy \(\dfrac{6}{12}< \dfrac{3}{4}\).
b)
\(\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\)
Mà \(\dfrac{2}{5}< \dfrac{4}{5}\)
Vậy \(\dfrac{2}{5}< \dfrac{8}{10}\).
c)
\(\dfrac{40}{35}=\dfrac{40:5}{35:5}=\dfrac{8}{7}\)
Mà \(\dfrac{8}{7}>\dfrac{6}{7}\)
Vậy \(\dfrac{40}{35}>\dfrac{6}{7}\).
d)
\(\dfrac{8}{16}=\dfrac{8:8}{16:8}=\dfrac{1}{2}\)
Mà \(\dfrac{1}{2}< \dfrac{5}{2}\)
Vậy \(\dfrac{8}{16}< \dfrac{5}{2}\).
\(a.\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{1\times3}{2\times3}=\dfrac{3}{6}\)
\(\dfrac{25}{75}=\dfrac{1}{3}=\dfrac{1\times2}{3\times2}=\dfrac{2}{6}\)
\(b.\dfrac{42}{56}=\dfrac{3}{4}=\dfrac{3\times2}{4\times2}=\dfrac{6}{8}\)
\(\dfrac{18}{48}=\dfrac{3}{8}\)
\(c.\dfrac{27}{81}=\dfrac{1}{3}=\dfrac{1\times4}{3\times4}=\dfrac{4}{12}\)
\(\dfrac{57}{76}=\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)
\(\dfrac{35}{84}=\dfrac{5}{12}\)
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a)\(\frac{13}{14}\) b)\(\frac{23}{42}\) c)\(\frac{41}{152}\)d)\(\frac{8575}{512}\)
mình chỉ biết làm bài 1 thôi
\(\frac{169}{182}=\frac{13}{14}\)
b,\(\frac{2323}{4242}\)=\(\frac{23}{42}\)
c,\(\frac{123123}{456456}\)=\(\frac{41}{152}\)
\(\frac{35\cdot54}{16\cdot49\cdot10}=\frac{27}{112}\)
2,,\(\frac{16}{36}=\frac{4}{9}\) \(\frac{20}{45}=\frac{4}{9}\) \(\frac{28}{63}=\frac{4}{9}\)
Vậy 3 phân số này bằng nhau.
b,\(\frac{45}{65}=\frac{9}{13}\) \(\frac{48}{52}=\frac{12}{13}\) \(\frac{2121}{1313}=\frac{21}{13}\)
Vậy phân số \(\frac{2121}{1313}\) lớn nhất
a) 12/36 và -16/20
rút gọn 12/36 = 4/9
rút gọn -16/20= -4/5
quy đồng 4/9=20/45
quy đồng -4/5= -36/45
b) 21/105 và 35/150
rút gọn 21/105=7/35
rút gọn 35/150 =7/30
quy đồng 7/35 =210/105
quy đồng 7/30 = 245/105