1. \(\dfrac{15}{10}=\dfrac{3}{2};\dfrac{18}{27}=\dfrac{2}{3};\dfrac{8}{100}=\dfrac{2}{25};\dfrac{2}{100}=\dfrac{1}{50}\)

2.\(MSC:36\\ \dfrac{1}{4}=\dfrac{1\times9}{4\times9}=\dfrac{9}{36};\dfrac{2}{9}=\dfrac{2\times4}{9\times4}=\dfrac{8}{36}\\ \\ MSC:6\\ \dfrac{5}{6};\dfrac{1}{3}=\dfrac{1\times2}{3\times2}=\dfrac{2}{6}\)

vậy 5/6 =5 x mấy

a) 2/4; 3/6; 4/8; 5/10
b) 160/200; 240/300; 320/400; 400/500

a)\(\frac{1}{2}=\frac{2}{4}=\frac{3}{6}=\frac{4}{8}=\frac{5}{10}\)

b)\(\frac{80}{100}=\frac{40}{50}=\frac{20}{25}=\frac{4}{5}=\frac{16}{10}\)

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

\(\frac{20}{5}=\frac{120}{30};\frac{7}{6}=\frac{35}{30}\)

\(\frac{1}{6}\)    \(\frac{7}{9}\)    \(\frac{1}{12}\)

\(\frac{5}{12}và\frac{9}{12}\)    \(\frac{120}{30}và\frac{35}{30}\)

1/2 = 2/4; 2/4 = 4/8 ; 4/8 = 8/16;1/4 = 2/8 ; 1/8 = 2/16 ;8/2 = 16/4;2/4 = 8/16;2/8 = 4/16; 2/4 = 8/4 ;8/4 = 16/8; 8/2 = 4/1;2/1 =4/2; 

\(\frac{1}{2}=\frac{2}{4};\frac{2}{4}=\frac{4}{8};\frac{4}{8}=\frac{8}{16};\frac{1}{4}=\frac{2}{8};\frac{1}{8}=\frac{2}{16};\frac{8}{2}=\frac{16}{4};\frac{2}{4}=\frac{8}{16}\)

\(\frac{2}{8}=\frac{4}{16};\frac{2}{4}=\frac{8}{16};\frac{8}{4}=\frac{16}{8};\frac{8}{2}=\frac{4}{1};\frac{2}{1}=\frac{4}{2}\)

1/2;1/4;1/8;1/16;

có ai muốn kết bạn với tớ ko nhờ

Ta có

\(\frac{1}{3}=\frac{1\times12}{3\times12}=\frac{12}{36}\)

\(\frac{3}{4}=\frac{3\times9}{4\times9}=\frac{27}{36}\)

10 phân số đó là \(\frac{1}{3}=\frac{12}{36}< \frac{13}{36};\frac{14}{36};\frac{15}{36};...;\frac{21}{36};\frac{22}{36}< \frac{27}{36}=\frac{3}{4}\)

Hok tốt !!!!!!!!!

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, \(\frac{16x8-16x2}{12}=\frac{16x\left(8-2\right)}{12}=\frac{8x6}{6}=\frac{8}{1}\)

sorry các bn nhầm cho phân số 19/42 

   và thì đc phân số mới bằng 3/7

mk k 10 bnnhanh nhất