98/100 = 49/50                         1212/1313 = 12/13                 

123123/234234 = 123/234        20182018/20152015 = 2018/2015

\(\frac{27272727}{43434343}=\frac{27272727:1010101}{43434343:1010101}=\frac{27}{43}\)

\(\frac{27272727}{43434343}=\frac{27x1010101}{43x1010101}=\frac{27}{43}\)

27272727/43434343=1010101x27/1010101x43=27/43

chắc chắn 100% k cho mình nhata phuong anh

a, \(-\dfrac{315}{540}\) = \(\dfrac{-315:45}{540:45}\) = \(\dfrac{-7}{12}\)        b,   \(\dfrac{25.13}{26.35}\) = \(\dfrac{25.13:5:13}{26.35:13:5}\) = \(\dfrac{5}{14}\)

c,     \(\dfrac{6.9-2.17}{63.3-119}\) = \(\dfrac{2.3.9-2.17}{7.9.3-7.17}\) = \(\dfrac{2.(27-17)}{7.(7-17)}\) = \(\dfrac{2}{7}\)

d, \(\dfrac{3.13-13.18}{15.40-80}\) = \(\dfrac{3.13(1-6)}{40.(15-2)}\) = \(\dfrac{-3.13.5}{40.13}\) = \(\dfrac{-15}{40}\) = \(\dfrac{-15:5}{40:5}\) = \(-\dfrac{3}{8}\)

để rút gọn đc thì 63 chia hết cho x+1

=>x+1 thuộc Ư(63)

mà Ư(63)=1,3,7,9,2163

=>x+1=1,3,7,9,21,63

x=0,2,6,8,20,62

-2/3

7/13

3/5

TK
-2/3

7/13

3/5

tham khảo

-2/3

7/13

3/5

Tự chép đề bài nhé

=\(\frac{11.11.25.3.65.2.169}{3.13.2.30.11.18.11}\)

=\(\frac{25.65.13.13}{13.30.18}\)

=\(\frac{5.5.65.13.13}{13.6.5.18}\)

=\(\frac{5.65.13}{6.18}\)

=\(\frac{65.65}{108}\)

tự tính tiếp

\(\frac{121.75.130.169}{39.60.11.198} \)​= \(\frac{11^2.5^2.3.13.5.2.13^2}{3.13.2^2.3.5.11.2.3^2}\)

                                      = \(\frac{11.5^2.13^2}{2^2.3^3}\)

Mình ko hiểu cho lắm !!!*.*😕😦

Ta có:\(\hept{\begin{cases}\frac{a}{b}=\frac{5}{14}\\\frac{a}{b-7}=\frac{3}{7}\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}14a=5b\\7a=3\left(b-7\right)\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}14a=5b\\14a=6\left(b-7\right)\end{cases}}\)

\(\Rightarrow5b=14a=6\left(b-7\right)\)

\(\Rightarrow5b=6b-42\)

\(\Rightarrow6b-5b=42\)

\(\Rightarrow b=42\)

\(a=5b:14=5.42:14=15\)

Vậy phân số \(\frac{a}{b}\)cần tìm là\(\frac{15}{42}\)

5/7 = 55/77  18/11 = 126/77  

Ta thấy 126 – 55 = 71.  

Phân số a/b là phân số  55/77

55/77