1/2 , 1/5, 4/7,  2/3 , 5/3

5/10=1/2

3/15=1/5

40/70=4/7

24/36=2/3

70/42=5/3

CHÚC BÀ HỌC GIỎI

bài làm:

5/10=1/2  3/15=1/5  40/70=4/7   24/36=4/6   70/42=5/3

học tốt nha :3

5/10 = 1/2

3/15 = 1/5

40/70 = 4/7

24/36 = 2/3

70/42 = 5/3

5/10=1/2               3/15=1/5                40/70=4/7

24/36=2/3             70/42=5/3

a) \(\dfrac{56}{42}=\dfrac{28}{21}=\dfrac{4}{3}\)

\(\dfrac{16}{24}=\dfrac{2}{3}=\dfrac{8}{12}=\dfrac{40}{60}\)

b) \(\dfrac{40}{25}=\dfrac{8}{5}\)

\(\dfrac{63}{81}=\dfrac{7}{9}\)

\(\dfrac{36}{60}=\dfrac{3}{5}\)

-24/42=-4/7

-24/36=-2/3

-8/56=-1/7

29/-87=-1/3

51/-18=-17/3

1. \(\frac{5}{10}=\frac{1}{2};\frac{3}{15}=\frac{1}{5};\frac{40}{70}=\frac{4}{7};\frac{24}{36}=\frac{2}{3};\frac{70}{42}=\frac{5}{3}\)

2. a) MSC: 12

Ta có: \(\frac{5}{3}=\frac{5.4}{3.4}=\frac{20}{12};\frac{1}{4}=\frac{1.3}{4.3}=\frac{3}{12}\)

b) MSC: 24

Ta có: \(\frac{3}{8}=\frac{3.3}{8.3}=\frac{9}{24}\) và \(\frac{7}{24}\)

c) MSC: 30

Ta có: \(\frac{1}{2}=\frac{1.15}{2.15}=\frac{15}{30}\)

            \(\frac{2}{3}=\frac{2.10}{3.10}=\frac{20}{30}\)

             \(\frac{3}{5}=\frac{3.6}{5.6}=\frac{18}{30}\)

1.

\(\frac{5}{10}\)=    \(\frac{5:5}{10:5}\)=    \(\frac{1}{2}\)                                    \(\frac{3}{15}\)=    \(\frac{3:3}{15:3}\)=    \(\frac{1}{5}\)

\(\frac{40}{70}\)=    \(\frac{40:10}{70:10}\)=    \(\frac{4}{7}\)                                 \(\frac{24}{36}\)=    \(\frac{24:12}{36:12}\)=    \(\frac{2}{3}\)

                   \(\frac{70}{42}\)=    \(\frac{70:14}{42:14}\)=    \(\frac{5}{3}\)

1.\(\frac{5}{10}\)= \(\frac{5:5}{10:5}\)=\(\frac{1}{2}\); \(\frac{3}{15}\)= \(\frac{3:3}{15:3}\)=\(\frac{1}{5}\); \(\frac{40}{70}\)=\(\frac{40:10}{70:10}\)=\(\frac{4}{7}\); \(\frac{24}{36}\)=\(\frac{24:12}{36:12}\)=\(\frac{2}{3}\); \(\frac{70}{42}\)=\(\frac{70:14}{42:14}\)=\(\frac{5}{3}\)

2. \(\frac{5}{3}\)và \(\frac{1}{4}\)

MC( 3 , 4) = 12

12:3 = 4

12:4= 3

Quy đồng : \(\frac{5}{3}\)= \(\frac{5x4}{3x4}\)= \(\frac{20}{12}\); \(\frac{1}{4}\)= \(\frac{1x3}{4x3}\)= \(\frac{3}{12}\)

\(\frac{3}{8}\) và \(\frac{7}{24}\)

MC( 8 , 24 ) = 24

24: 8 = 3

24:24 =1

Quy đồng:\(\frac{3}{8}\)= \(\frac{3x3}{8x3}\)=\(\frac{9}{24}\); \(\frac{7}{24}\)=\(\frac{7x1}{24x1}\)= \(\frac{7}{24}\)

\(\frac{1}{2}\),\(\frac{2}{3}\)và  \(\frac{3}{5}\)

MC( 2 , 3, 5) =30 

30:2= 15

30: 3= 10

30: 5 =6

Quy đồng;\(\frac{1}{2}\)=\(\frac{1x15}{2x15}\)=\(\frac{15}{30}\); \(\frac{2}{3}\)=\(\frac{2x10}{3x10}\)=\(\frac{20}{30}\); \(\frac{3}{5}\)=\(\frac{3x6}{5x6}\)=\(\frac{18}{30}\)

CHÚC BẠN HỌC TỐT

`6/10=3/5`

`70/9=70/9`

`96/72=4/3`

`45/35=9/7`

`24/36=2/3`

`25/100=1/4`

$6/10=(6:2)/(10:2)=3/5$

$70/9$ ( tối giản)

$96/72=(96:24)/972:24)=4/3$

$45/35=(45:5)/(35:5)=9/7$

$24/36=(24:12)/(36:12)=2/3$

$25/100=(25:25)/(100:25)=1/4$

giúp mình với, đi mà mọi người mình đang cần gấp mà

a) 2/3,1/4,1/2,21/44
b) 2/3,3/5,1/8,1/3

a, 24/-42 = -24/42= -4x6/7x6 =-4/7

b,-24/36 = -2x12/3x12 =-2/3

c,-8/56= -1x8/7x8 =-1/7

d,29/-87= -29/87 =-1x29/3x29 =-1/3

e, -3x35/42x9 =-1x3x5x7/6x7x3x3  =-1x5/3x6 =-5/18

f,-45045 / 6006000=-45x1001 /6000x1001=45/6000=3x15/15x400=3/400

\(a.\frac{-4}{7},b.\frac{-2}{3},c.\frac{-1}{7},d.\frac{-1}{3},e.\frac{-5}{18},f.\frac{-3}{400}\)

Theo thứ tự : 5/6 ; 2/3 ; 2/3 ; 3/2 ; 2/3 ; 3/8 ; 3/1(hay là 3)

\(\dfrac{10}{12}=\dfrac{5}{6}\)        \(\dfrac{8}{12}=\dfrac{2}{3}\)        \(\dfrac{10}{15}=\dfrac{2}{3}\)        \(\dfrac{27}{18}=\dfrac{3}{2}\)        \(\dfrac{24}{36}=\dfrac{4}{6}=\dfrac{2}{3}\)

\(\dfrac{18}{48}=\dfrac{3}{8}\)        \(\dfrac{42}{14}=\dfrac{6}{2}=\dfrac{3}{1}\)

10/12 = 5/6 

8/12 = 2/3 

10/15 = 2/3 

27/18 = 3/2 

18/48 = 3/8 

42/14 = 3