\(\frac{7500-100}{600-35}=\frac{7400}{565}=\frac{1480}{113}\)

`27/81=(27:27)/(81:27)=1/3`

`57/76=(57:19)/(76:19)=3/4`

`35/84=(35:7)/(84:7)=5/12`

`MSC:12`

`1/3=(1xx4)/(3xx4)=4/12`

`3/4=(3xx3)/(4xx3)=9/12`

`5/12` giữ nguyên

\(\dfrac{27}{81}=\dfrac{1}{3}\); \(\dfrac{57}{76}=\dfrac{3}{4}\); \(\dfrac{35}{84}=\dfrac{5}{12}\)

\(\dfrac{1}{3}=\dfrac{4}{12}\)

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

Giữa nguyên 5/12

1.Rút gọn: 27 phần 81 =1phần3.

                 57 phần 76  = 3 phần 4.

                 35 phần 84 = 5 phần 12.          

2.Quy đồng:1 phần 3 = 4 phần 12

                   3 phần tư = 9 phần 12

                   5 phần 12 = 5 phần 12

27/81 = 1/3

57/76 = 3/4

35/84 = 5/12

Quy đồng : 1/3 = 4/12 ; 3/4 = 9/12 còn 5/12 giữ nguyên

1: Rút gọn

a) \(-\dfrac{33}{51}=\dfrac{-33:3}{51:3}=\dfrac{-11}{17}\)

b) \(\dfrac{156}{-168}=\dfrac{-156}{168}=\dfrac{-156:12}{168:12}=\dfrac{-13}{14}\)

c) \(\dfrac{-75}{-100}=\dfrac{75}{100}=\dfrac{75:25}{100:25}=\dfrac{3}{4}\)

2: Quy đồng mẫu:

a) \(-\dfrac{3}{8}\) và \(\dfrac{5}{4}\)

MSC: 8

\(-\dfrac{3}{8}=\dfrac{-3}{8}\)

\(\dfrac{5}{4}=\dfrac{5\cdot2}{4\cdot2}=\dfrac{10}{8}\)

b) \(\dfrac{-7}{6}\) ; \(\dfrac{5}{12}\) và \(-\dfrac{5}{6}\)

MSC: 12

\(-\dfrac{7}{6}=\dfrac{-7\cdot2}{6\cdot2}=\dfrac{-14}{12}\)

\(\dfrac{5}{12}=\dfrac{5}{12}\)

\(\dfrac{-5}{6}=\dfrac{-5\cdot2}{6\cdot2}=\dfrac{-10}{12}\)

\(\dfrac{12}{60}=\dfrac{12:12}{60:12}=\dfrac{1}{5}\)

\(\dfrac{12:12}{60:12}=\dfrac{1}{5}\)

\(\dfrac{12}{60}=\dfrac{12:12}{60:12}=\dfrac{1}{5}\)

D

D?

D

143/132=1,083

3535/3737=0,945

ko dư nha

\(\frac{143}{132}=\frac{13}{12}\)

\(\frac{3535}{3737}=\frac{35}{37}\)

Rút gọn:

\(\frac{35}{45}=\frac{35}{45}:\frac{5}{5}=\frac{7}{9}\)

HT

35/45 = 35 : 5 / 45 : 5 = 7/9 nhé

Rút gọn PS :

35/45 = 35/45 : 5/5 = 7/9

TL

\(\dfrac{70}{5}=\dfrac{70\div5}{5\div5}=14\)

= 70 : 5 , 5: 5

= 14/1

=14

\(\dfrac{70}{5}\)=14(lấy tử chia mẫu)