− 6 − 10 = 36 60 = 3 5 ; 10 12 = 30 36 = 5 6 ; 15 − 21 = − 25 35 = − 5 7

$\frac{2}{3} = \frac{{2 \times 3}}{{3 \times 3}} = \frac{6}{9}$

$\frac{3}{4} = \frac{{3 \times 3}}{{4 \times 3}} = \frac{9}{{12}}$

Vậy $\frac{2}{3} = \frac{6}{9}$  ;   $\frac{3}{4} = \frac{9}{{12}}$

\(\dfrac{2}{3}=\dfrac{6}{9}\)

\(\dfrac{3}{4}=\dfrac{9}{12}\)

a)  6 8 = 18 24 = 36 48 = 3 4 ; − 12 15 = − 24 30 = 40 − 50 = − 4 5

b)  − 6 − 10 = 36 60 = 3 5 ; 10 12 = 30 36 = 5 6 ; 15 − 21 = − 25 35 = − 5 7

6 8 = 18 24 = 36 48 = 3 4 ; − 12 15 = − 24 30 = 40 − 50 = − 4 5

11 22    =    − 15 − 30    ;    − 20 30    = 18 − 27 ;    17 − 34    = − 19 38

a ) 11 22 = − 15 − 30 = 1 2 ; 17 − 34 = − 19 38 = − 1 2 ; − 20 30 = 18 − 27 = − 2 3

b ) 2 − 8 = − 11 44 = − 1 4 ; 25 35 = − 15 − 21 = 5 7 ; 20 16 = − 50 − 40 = 5 4

a)  10 20 = − 12 − 24 = 1 2 ; 13 26 = − 21 42 = − 1 2 ; − 20 30 = 18 − 27 = − 2 3

b)  5 15 = − 11 33 = − 1 3 ; 24 36 = − 20 − 30 = 2 3 ; 24 16 = − 15 − 10 = 3 2

Câu 9: C

B

Giải:

Các cặp phân số bằng nhau lập được từ đẳng thưc 3.4 = 6.2 là :

  \(\frac{3}{6}=\frac{2}{4}\); \(\frac{6}{2}=\frac{4}{2}\); \(\frac{4}{6}=\frac{2}{3}\); \(\frac{3}{2}=\frac{6}{4}\)

 Vậy ...

\(\frac{1}{6}=\frac{1}{8}+\frac{1}{24}=\frac{1}{9}+\frac{1}{18}\)

\(\frac{3}{35}=\frac{1}{35}+\frac{1}{35}+\frac{1}{35}=\frac{1}{70}+\frac{1}{14}\)

Nếu đúng thì k mk nha