Question

So sánh các phân số

a)\(\dfrac{12}{14};\dfrac{1212}{1414};\dfrac{121212}{141414}\)

b)\(\dfrac{24}{35};\dfrac{2424}{3535};\dfrac{242424}{353535}\)

c)\(\dfrac{22}{25}\) và \(\dfrac{224466}{255075}\)

d)\(\dfrac{122436}{132639}\)và \(\dfrac{12}{13}\)

Answer 1

a)Ta có : \(\dfrac{1212}{1414}=\dfrac{12.101}{14.101}=\dfrac{12}{14}\)

\(\dfrac{121212}{242424}=\dfrac{12.10101}{24.10101}=\dfrac{12}{24}\)

Vậy \(\dfrac{12}{24}=\dfrac{1212}{2424}=\dfrac{121212}{242424}\)

Answer 2

Ta có : \(\dfrac{2424}{3535}=\dfrac{24.101}{35.101}=\dfrac{24}{35}\)

\(\dfrac{242424}{353535}=\dfrac{24.10101}{35.10101}=\dfrac{24}{35}\)

Vậy \(\dfrac{24}{35}=\dfrac{2424}{3535}=\dfrac{242424}{353535}\)

Answer 3

Ta có : \(\dfrac{224466}{255075}=\dfrac{22.10203}{25.10203}=\dfrac{22}{25}\)

Vậy \(\dfrac{22}{25}=\dfrac{224466}{255075}\)

Answer 4

Ta có : \(\dfrac{122436}{132639}=\dfrac{12.10203}{13.10203}=\dfrac{12}{13}\)

Vậy \(\dfrac{122436}{132639}=\dfrac{12}{13}\)

Answer 5

\(a,\dfrac{1212}{1414}=\dfrac{1212\div101}{1414\div101}=\dfrac{12}{14};\dfrac{121212}{141414}=\dfrac{121212\div10101}{141414\div10101}=\dfrac{12}{14}\)

Vì \(\dfrac{12}{14}=\dfrac{12}{14}=\dfrac{12}{14}\)nên ...

\(b,\dfrac{2424}{3535}=\dfrac{2424\div101}{3535\div101}=\dfrac{24}{35};\dfrac{242424}{353535}=\dfrac{242424\div10101}{353535\div10101}=\dfrac{24}{35}\)

Vì \(\dfrac{24}{35}=\dfrac{24}{35}=\dfrac{24}{35}\)nên ...

Mình làm cho bạn 2 phần đầu này thôi nhé , phần sau bạn làm tiếp nhé !