1 ,Rut gon phan so 75/125; 1717/1313 ; 203203/207207
2, phân sô nao bằng 5/7
25/35 , 19/27 , 120/140, 49/35 , 16/28 , 85/149
1 ,Rut gon phan so 75/125; 1717/1313 ; 203203/207207
2, phân sô nao bằng 5/7
25/35 , 19/27 , 120/140, 49/35 , 16/28 , 85/149
Đáp án:
`1`/ Ta có :
`75/125` `=` `(75÷25)/(125÷25)` `=` `3/5`
`1717/1313` `=` `(1717÷101)/(1313÷101)` `=` `17/13`
`203203/207207` `=` `(203203÷1001)/(203203÷1001)` `=` `203/207`
`2`/ Ta có :
(+) `25/35` `=` `(25÷5)/(35÷5)` `=` `5/7`
(+) `19/27` `=` `19/27`
(+) `120/140` `=` `(120÷20)/(140÷20)` `=` `6/7`
(+) `49/35` `=` `(49÷7)/(35÷7)` `=` `7/5`
(+) `16/28` `=` `(16÷4)/(28÷4)` `=` `4/7`
(+) `85/149` `=` `85/149`
Vậy phân số bằng phân số `5/7` là phân số `25/35`
$1:$
$\frac{75}{125}$ $=$ $\frac{75 : 25}{125:25}$ $=$ $\frac{3}{5}$
$\frac{1717}{1313}$ $=$ $\frac{1717:101}{1313:101}$ $=$ $\frac{17}{13}$
$\frac{203203}{207207}$ $=$ $\frac{203203:1001}{207207:1001}$ =$\frac{203}{207}$
$2:$
$\frac{25}{35}$ $=$ $\frac{25:5}{35:5}$ $=$ $\frac{5}{7}$
$\frac{19}{27}$ $=$ $\frac{19}{27}$
$\frac{120}{140}$ $=$ $\frac{120:20}{140:20}$ $=$ $\frac{6}{7}$
$\frac{49}{35}$ = $\frac{49:7}{35:7}$ $=$$\frac{7}{5}$
$\frac{16}{28}$ $=$ $\frac{16:4}{28:4}$ $=$ $\frac{4}{7}$
$\frac{85}{149}$ $=$$\frac{85}{149}$
Vậy phân số $\frac{25}{35}$ $=$ phân số $\frac{5}{7}$
$@Yuu$