Question

 rút gọn các phân số sau đến tối giản 

a)\(\frac{3.21}{14.15}\)                                   b)\(\frac{49+7.49}{49}\)

Answer 1

a)rút gọn 3 vs 15

14vs21

=1.5

b)=8

Answer 2

a)\(\frac{3.21}{14.15}=\frac{1.3}{2.5}=\frac{3}{10}\)

b)\(\frac{49+7.49}{49}=\frac{49.\left(1+7\right)}{49}=\frac{8}{1}=8\)

Answer 3

a)\(\frac{3.21}{14.15}=\frac{1.3}{2.5}=\frac{3}{10}\)

b)\(\frac{49+7.49}{49}=\frac{49.\left(1+7\right)}{49}=1.8=8\)

Answer 4

a,\(\frac{3.21}{14.15}=\frac{3.3.7}{2.7.3.5}=\frac{3}{10}\)

b,\(\frac{49+7.49}{49}=\frac{49.\left(1+7\right)}{49}=1.8=8\)

Answer 5

\(\frac{3.21}{14.15}=\frac{3.3.7}{7.2.5.3}=\frac{3}{10}\)

\(\frac{49+7.49}{49}=\frac{8.49}{49}=8\)

Answer 6

GIẢI :

a) \(\frac{3\cdot21}{14\cdot15}=\frac{3\cdot3\cdot7}{2\cdot7\cdot3\cdot5}=\frac{3}{2\cdot5}=\frac{3}{10}\) ;

b) \(\frac{49+7\cdot49}{49}=\frac{49 (1+7)}{49}=1+7=8\).