a) Có 143/363 = 13/33
=> 13/33 = 143/363
b)Có 12/27 = 4/9
1212/2727 = 4/9
=> 12/27 = 1212/2727
a) Ta có: \(\dfrac{13}{33}=\dfrac{143}{363}\)
Mà \(\dfrac{143}{363}=\dfrac{143}{363}\)
Vậy \(\dfrac{13}{33}=\dfrac{143}{363}\)
b) Ta có: \(\dfrac{12}{27}=\dfrac{1212}{2727}\)
Mà \(\dfrac{1212}{2727}=\dfrac{1212}{2727}\)
Vậy \(\dfrac{12}{27}=\dfrac{1212}{2727}\)
a) Ta có :
\(\dfrac{13}{33}=\dfrac{13.11}{33.11}=\dfrac{143}{363}\)
\(\Rightarrow\dfrac{13}{33}=\dfrac{143}{363}\) ( điều phải chứng minh )
Vậy ......
b) Ta có :
\(\dfrac{1212}{2727}=\dfrac{1212:101}{2727:101}=\dfrac{12}{27}\)
\(\Rightarrow\dfrac{1212}{2727}=\dfrac{12}{27}\) ( điều phải chứng minh )
Vậy ......
Chúc bạn học tốt
a, 13 / 33 x 11 / 11 = 143 / 363
b, 1212 / 2727= 1200 + 12 / 2700+ 27= 12 x ( 100 + 1 ) / 27 x ( 100 + 1 ) = 12 x 101 / 27 x 101 = 12 / 27
Lời giải:
a.
\(\frac{143}{363}=\frac{143:11}{363:11}=\frac{13}{33}\)
b.
\(\frac{1212}{2727}=\frac{1212:101}{2727:101}=\frac{12}{27}\)