\(\dfrac{7}{9}=\dfrac{7\times5}{9\times5}=\dfrac{35}{45}\)
\(\dfrac{2}{5}=\dfrac{2\times9}{5\times9}=\dfrac{18}{45}\)
\(---------\)
\(\dfrac{6}{7}=\dfrac{6\times3}{7\times3}=\dfrac{18}{21}\)
\(\dfrac{17}{21}=\dfrac{17}{21}\)

-9/6; -5/6; -9/6

90/45; -90/45; -35/45

168/210;245/210;270/210

Ta có:2/3=2*10/3*10=20/30

         4/5=4*6/5*6=24/30

        5/6=5*5/6*5=25/30

Vậy quy đồng 3 phân số 2/3 ;4/5 và 5/6 được 20/30 ; 24/30 và 25/30

chọn k đúng cho mk nha

\(\frac{2}{3}=\frac{2x10}{3x10}=\frac{20}{30}\)

\(\frac{4}{5}=\frac{4x6}{5x6}=\frac{24}{30}\)

\(\frac{5}{6}=\frac{5x5}{6x5}=\frac{25}{30}\)

Vậy ..............

\(\dfrac{10}{60};\dfrac{30}{60};\dfrac{36}{60}\)

1/6 = 20/120 ; 2/4 = 60/120 ; 3/5 = 72/120

10/60; 30/60; 36/60

10/60 ; 30/60 ; 36/60

vì 6/5>1 còn 99/100<1 nên 6/5>99/100

6/5 > 1

99/100 < 1

6/5 > 99/100

nhớ tick nha

\(30/55; 77/55\)

\(14/12; 17/12\)

30/55 ; 77/55

14/12 ; 17/12

\(\dfrac{30}{55}\)và\(\dfrac{77}{55}\)

\(\dfrac{14}{12}\)và\(\dfrac{17}{12}\)

bài3

1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)

\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)

2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)

\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)

3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)

\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)

4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)

\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)

TL

Phân số là 3/45/4

HT

Sao lại thế

MSC:60 NHA BẠN 

ko bé ơi 

lớp tui có bạn cũng tên Nguyễn Trung Hiếu