$\text{Bài 1:}$

`1, 12/24 = (12:12)/(24:12)=1/2 `

`2, (-24)/45 = (-24:3)/(45:3) = (-8)/15`

`3, 48/51 = (48 :3)/(51:3)=16/17`

`4, (-35)/75 = (-35:5)/(75:5)=(-7)/15`

`5, 132/144 = (132:12)/(144:12)=11/12`

`6, (-126)/270 = (-126:18)/(270:18)=(-7)/15`

`7, (-32)/70 = (-32:2)/(70:2)=(-16)/35`

`8, 45/75 = (45:15)/(75:15)=3/5`

`9, 42/1050 = (42:42)/(1050:42)=1/25`

`10, (4^{7})/4^{10} = (4^{7}:4^{7})/(4^{10}:4^{7}) = 1/(4^{3}) = 1/64`

`11, (6²)/(4²) = 6² : 4² = (6:4)² = (1,5)² = 2,25`

`12, (4.7.22)/(33.14) = (4.7.2.11)/(3.11.2.7) = 4/3`

`13, (9.6-9.2)/(18) = (9.(6 - 2))/(9.2) = (9.4)/(9.2) = 4/2 = 2`

`14, (13.2-13.3)/(1-14) = (13.(2-3))/(-13) = (13.(-1))/(-13) = (-13)/(-13) = 1`

`15, (84.45)/(49.54) = (7.2.6.9.5)/(7.7.9.6) = (2.5)/7 = 10/7`

`16, (-378)/440 = (-378:2)/(440:2)=(-189)/220`

$\text{Bài 2:}$ $\text{Ta có:}$

`(-60)/85 = (-60:5)/(85:5)=(-12)/17`

`(-77)/56 = (-77:7)/(56:7) = (-11)/8`

`246/180 = (246:6)/(180:3)=41/30`

$\text{⇒ Các cặp phân số bằng nhau là:}$

`(-12)/17` $\text{và}$ `(-60)/85`

`(-77)/56` $\text{và}$ `(-11)/8`