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Ta có : \(\frac{10}{15}=\frac{2}{3}\)
\(\frac{15}{20}=\frac{3}{4}\)
\(\frac{34}{51}=\frac{2}{3}\)
\(\frac{51}{68}=\frac{3}{4}\)
\(\frac{36}{54}=\frac{2}{3}\)
\(\frac{54}{72}=\frac{3}{4}\)
\(\Rightarrow\frac{10}{15}=\frac{34}{51}=\frac{36}{54}\left(=\frac{2}{3}\right)\);\(\frac{15}{20}=\frac{51}{68}=\frac{54}{72}\left(=\frac{3}{4}\right)\)
Bài 1:
a: 6/9=2/3
6/24=1/4
48/96=1/2
42/98=3/7
b: 24/36=2/3
18/30=3/5
15/120=1/8
80/240=1/3
c: 5/25=1/5
75/100=3/4
64/720=4/45
16/1000=2/125
Bài 2:
Các phân số bằng 2/3 là 34/51; 20/30; 84/126
Bài 1 :
a) 6/9 = 2/3 ; 6/24 = 1/4 ; 48/96 = 1/2 ; 42/98 = 3/7
b) 24/36 = 2/3 ; 18/30 = 3/5 ; 15/120 = 1/8 ; 80 / 240 = 1/3
c) 5 / 25 = 1/5 ; 75/100=3/4 ; 64/720=4/45 ; 16/1000=2/125
Bài 2 :
Các phân số bằng 2/3 là :
\(\text{34/51; 20/30; 84/126}\)
a: 5/3=10/6=25/15=35/21
b: 5/7=35/49
6/15=12/30
4/5=16/20
c: 6=216/36=324/54=108/18
a)\(\dfrac{5}{3}=\dfrac{10}{6}=\dfrac{25}{15}=\dfrac{35}{21}\)
b)\(\dfrac{5}{7}=\dfrac{35}{49};\dfrac{6}{15}=\dfrac{12}{30};\dfrac{4}{5}=\dfrac{16}{20}\)
c) \(6=\dfrac{216}{36}=\dfrac{324}{54}=\dfrac{108}{18}\)
c1
a,3/15 = 3:3/15:3 = 15
33/44 = 33:11/44:11 = 34
2/8 = 2:2/8:2 = 1/4
b,9/12 =9:3/12:3 = 34
24/36 =24:12/36:12 = 23
3/8 = 3:1/8:1 = 3/8
c2
a) =12x(4+6)/24
= 12x10/24
=120/24
=5
b,16x8-16x2/12x4
=16x(8-2)/48
=16x6/48
=2
c3
5/8=45/72
20/15=4/3=96/72
24/32=3/4=54/72
15/18=5/6=60/72
77/99=7/9=56/72
c4
2/3=2/3
12/15=4/5
24/18=4/3
16/48=1/3
75/100=3/4
30/45=2/3
12/36=1/3
20/15=4/3
các phân số lớn hơn 1 luôn có mẫu số bé hơn tử số
vậy các số lớn hơn 1 là 24/18,20/15
k mk nha thank mọi ng'
a, \(\frac{3}{15}=\frac{1}{5}=\frac{4}{20}\); \(\frac{33}{44}=\frac{3}{4}=\frac{15}{20}\); \(\frac{2}{8}=\frac{1}{4}=\frac{5}{20}\)
b, \(\frac{9}{12}=\frac{3}{4}=\frac{18}{24}\); \(\frac{24}{36}=\frac{2}{3}=\frac{16}{24}\); \(\frac{3}{8}=\frac{9}{24}\)
Bài 2 :
a,\(\frac{12x4+12x6}{24}=\frac{12x\left(4+6\right)}{24}=\frac{1x10}{2}=\frac{10}{2}=\frac{5}{1}\)
b, \(\frac{16x8-16x2}{12}=\frac{16x\left(8-2\right)}{12}=\frac{8x6}{6}=\frac{8}{1}\)
\(\frac{4}{12}=\frac{4:4}{12:4}=\frac{1}{3}\)
\(\frac{24}{30}=\frac{24:6}{30:6}=\frac{4}{5}\)
\(\frac{25}{100}=\frac{25:25}{100:25}=\frac{1}{4}\)
\(\frac{60}{80}=\frac{60:20}{80:20}=\frac{3}{4}\)
\(\frac{9}{18}=\frac{9:9}{18:9}=\frac{1}{2}\)
\(\frac{60}{36}=\frac{60:12}{36:12}=\frac{5}{3}\)
\(\frac{72}{54}=\frac{72:18}{54:18}=\frac{4}{3}\)
\(\frac{35}{210}=\frac{35:35}{210:35}=\frac{1}{6}\)
4/12=1/3
24/30=4/5
25/100=1/4
60/80=3/4
9/18=1/2
60/36=5/3
72/54=4/3
35/210=1/6
\(\frac{10}{25};\frac{14}{18};\frac{15}{20};\frac{16}{40};\frac{30}{48};\frac{63}{81}\)
\(=>\frac{10}{25}=\frac{2}{5}\)\(;\frac{14}{18}=\frac{7}{9};\frac{15}{20}=\frac{3}{4};\frac{16}{40}=\frac{2}{5};\frac{30}{48}=\frac{5}{8};\frac{63}{81}=\frac{7}{9}\)
\(=>\frac{2}{5};\frac{7}{9};\frac{3}{4};\frac{2}{5};\frac{5}{8};\frac{7}{9}\)
Phân số bằng nhau là : \(\frac{10}{25};\frac{16}{40}\)và \(\frac{14}{18};\frac{63}{81}\)
\(\frac{10}{15}=\frac{2}{3}\) \(\frac{14}{18}=\frac{7}{9}\) \(\frac{15}{20}=\frac{3}{4}\)
\(\frac{16}{40}=\frac{2}{5}\) \(\frac{36}{48}=\frac{3}{4}\) \(\frac{63}{81}=\frac{7}{9}\)
Vậy các phân số bằng nhau là :
\(\frac{15}{20}=\frac{36}{48}\) ; \(\frac{14}{18}=\frac{63}{81}\)
\(\frac{10}{15}=\frac{34}{51}=\frac{36}{54}\)
\(\frac{15}{20}=\frac{51}{68}=\frac{54}{72}\)