Là : \(\frac{5}{2};\frac{5}{6};\frac{3}{7}\) đúng ko bạn ?

\(MSC:42\)

\(\frac{5}{2}=\frac{5\times21}{2\times21}=\frac{105}{42}\)

\(\frac{5}{6}=\frac{5\times7}{6\times7}=\frac{35}{42}\)

\(\frac{3}{7}=\frac{3\times6}{7\times6}=\frac{18}{42}\)

\(\Leftrightarrow\frac{105}{42};\frac{35}{42};\frac{18}{42}\)

5 phần 2 = 210 phần 84 ; 5 phần 6 = 70 phần 84 ; 3 phần 7 = 36 phần 84

cac ban lam chi tiet nhe ko co giao minh mang

a,  4/7=16/28

                                   3/2=42/28

                                                                     5/4=35/28

b,             4/15=4/15

                                                 3/5=9/15

                                                                                                  2/3=10/15

\(\dfrac{5}{12}=\dfrac{25}{60}\\ \dfrac{8}{15}=\dfrac{32}{60}\\ \dfrac{7}{20}=\dfrac{21}{60}\)

\(\dfrac{-5}{5}\) và \(\dfrac{8}{7}\) MSC: 35

\(\dfrac{-5}{5}\) = \(\dfrac{-35}{35}\)

\(\dfrac{8}{7}\) = \(\dfrac{40}{35}\)

1/2,2/3=1x3/2x3,2x2/3x2=3/6,4/6

4/6,3/7=4x7/6x7,3x6/7x6=28/42,18/42

1/2,2/3=1x3/2x3,2x2/3x2=3/6,4/6=7/6

7/6,3/7=7x7/6x7,7x6/3x6=49/42,42/18

\(\frac{3.4+3}{6.5+9}=\frac{3.(4+1)}{3.10.3.3}=\frac{3.5}{3.(10+3)}=\frac{3.5}{3.13}=\frac{5}{14}\)

\(\frac{6 . 9 - 2.17}{63 . 3 - 119}=\frac{3 . ( 17 + 1 )-2 . 17}{189 - 119}\)

\(=\frac{3.17+3-2.17}{70}=\frac{\left(3-2\right).17+3}{70}\)

\(=\frac{17+3}{70}=\frac{20}{70}=\frac{2}{7}\)

- 2/3=20/30;4/5=24/30;5/6=25/30

- 5/6=440/528;7/8=462/528;9/11=432/528

a) \(\frac{12}{20}=\frac{5}{20}\)

b)\(\frac{9}{24}=\frac{7}{24}\)

c)\(\frac{15}{30}=\frac{20}{30}=\frac{18}{30}\)

Ai tk mình đi mình bị âm rồi!

Ai tk mình mình tk lại!