Rút gọn các phân số sau 12/30
20/45. 28/70. 34/51
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Rút gọn các phân số sau về phân số tối giản:
12/30 ................\(=\dfrac{12:6}{30:6}=\dfrac{2}{5}\)...........................................
20/45 ....................\(=\dfrac{20:5}{45:5}=\dfrac{4}{9}\)......................................
28/70.....................\(=\dfrac{28:14}{70:14}=\dfrac{2}{5}\).......................................
Rút gọn các phân số sau về phân số tối giản:
12/30 ..= 6/15........................................................
20/45 ..=4/9........................................................
28/70..=14/5..........................................................
34/51..=2/3..........................................................
215/300..=43/20.....................................................
1200/2010..=120/201.................................................
Bài 1 : Các số đó là : \(\frac{35}{60};\frac{46}{60}\)
Bài 2 :
\(\frac{12}{30}=\frac{12:6}{30:6}=\frac{2}{5}\); \(\frac{20}{45}=\frac{20:5}{45:5}=\frac{4}{9}\)
\(\frac{28}{70}=\frac{28:14}{70:14}=\frac{2}{5}\) ; \(\frac{34}{51}=\frac{34:17}{51:17}=\frac{2}{3}\)
rút gọn phân số :
12/30 =2/5
20/45= 4/9
28/70=2/5
34/51 =2/3
\(\frac{12}{30}=\frac{2}{5}\)
\(\frac{20}{45}=\frac{4}{9}\)
\(\frac{28}{70}=\frac{2}{5}\)
\(\frac{34}{51}=\frac{2}{3}\)
\(\frac{12}{30}\)= \(\frac{12:6}{30:6}\)= \(\frac{2}{5}\)
\(\frac{20}{45}\)=\(\frac{20:5}{45:5}\)=\(\frac{4}{9}\)
\(\frac{28}{70}\)=\(\frac{28:7}{70:7}\)=\(\frac{4}{10}\)=\(\frac{4:2}{10:2}\)=\(\frac{2}{5}\)
\(\frac{34}{51}\)=\(\frac{34:14}{51:14}\)=\(\frac{34:17}{51:17}\)= \(\frac{2}{3}\)
\(\frac{12}{30}=\frac{12:6}{30:6}=\frac{2}{5}\)
\(\frac{20}{45}=\frac{20:5}{45:5}=\frac{4}{9}\)
\(\frac{28}{70}=\frac{28:14}{70:14}=\frac{2}{5}\)
\(\frac{34}{51}=\frac{34:17}{51:17}=\frac{2}{3}\)
\(\dfrac{14}{28}=\dfrac{14:14}{28:14}=\dfrac{1}{2}\)
\(\dfrac{33}{99}=\dfrac{33:33}{99:33}=\dfrac{1}{3}\)
\(\dfrac{12}{80}=\dfrac{12:4}{80:4}=\dfrac{3}{20}\)
\(\dfrac{50}{150}=\dfrac{50:50}{150:50}=\dfrac{1}{3}\)
\(\dfrac{45}{9}=\dfrac{45:9}{9:9}=5\)
\(\dfrac{81}{72}=\dfrac{81:9}{72:9}=\dfrac{9}{8}\)
\(\dfrac{34}{68}=\dfrac{34:34}{68:34}=\dfrac{1}{2}\)
\(\dfrac{14}{28}=\dfrac{1}{2};\dfrac{33}{99}=\dfrac{11}{33};\dfrac{12}{80}=\dfrac{3}{20};\dfrac{50}{150}=\dfrac{1}{3};\dfrac{45}{9}=5;\dfrac{81}{72}=\dfrac{9}{8};\dfrac{34}{68}=\dfrac{1}{2}\)
c ) − 5 15 = ( − 5 ) : 5 15 : 5 = − 1 2 d ) − 12 − 24 = ( − 12 ) : ( − 12 ) ( − 24 ) : ( − 12 ) = 1 2
e ) 54 270 = 54 : 54 270 : 54 = 1 5 f ) − 12 − 28 = ( − 12 ) : ( − 4 ) ( − 28 ) : ( − 4 ) = 3 7
g ) − 18 − 27 = ( − 18 ) : ( − 9 ) ( − 27 ) : ( − 9 ) = 2 3 h ) 45 − 24 = 45 : ( − 3 ) ( − 24 ) : ( − 3 ) = − 15 8
12/30=6/15
20/45=4/9
28/70=2/5
34/51=2/3
Rút gọn các phân số sau 12/30
20/45. 28/70. 34/51
BL:
12/30=6/15
20/45=4/9
28/70=2/5
34/51=2/3