Question

Rút gọn các phân số sau :

\(\frac{2929-101}{2.2929+404}\)

\(\frac{2.3+4.6+14.21}{3.5+6.10+21.35}\) 

Giúp mk nha ,nhớ giải đầy đủ đó 

 

Answer 1

mk biet nhung dai dong lam

Answer 2

a) Ta có:

\(\dfrac{2929-101}{2.2929-404}=\dfrac{29.101-101}{2.29.101-4.101}=\dfrac{101.\left(29-1\right)}{101.\left(2.29-4\right)}=\dfrac{101.28}{101.54}=\dfrac{28}{54}=\dfrac{14}{27}\)

b) Ta có:

\(\dfrac{2.3+4.6+14.21}{3.5+6.10+21.35}=\dfrac{2.3+2.3.2^2+2.3.7^2}{3.5+3.5.2^2+3.5.7^2}=\dfrac{2.3.\left(1+2^2+7^2\right)}{3.5.\left(1+2^2+7^2\right)}=\dfrac{2.3}{3.5}=\dfrac{2}{5}\)