Question

rút gọn phân số:

\(a.\dfrac{-315}{540}\)      

\(b.\dfrac{25.13}{26.35}\)

\(c.\dfrac{3.13-13.18}{15.40-80}\)

\(d.\dfrac{-1997.1996+1}{\text{(}-1995\text{)}.\left(-1997\right)+1996}\)

Answer 1

giúp mik đi nhé 

mik đang cần gấp nèeee

Answer 2

a,-7/12

b,5/14

c,-3/8

d,-1

 

Answer 3

,

,,,,,,,,,ư

 

 

Answer 4

a)-315/540=-7/12

b)25.13/26.35=5.5.13/13.2.5.7=5/2.7=5/14

c)3.13-13.18/15.40-80

=13.(3-18)/40.(15-2)

=13.-15/40.13

=-15/40=-3/8

d)-1997.1996+1/-1995.-1997+1996

=-3986011/3986011

=-1

Answer 5

a) \(\dfrac{-315}{540}=\dfrac{-315:45}{540:45}=\dfrac{-7}{12}\)

Answer 6

b) \(\dfrac{25\cdot13}{26\cdot35}=\dfrac{25}{35}\cdot\dfrac{13}{26}=\dfrac{5}{7}\cdot\dfrac{1}{2}=\dfrac{5}{14}\)

Answer 7

c) \(\dfrac{3\cdot13-13\cdot18}{15\cdot40-80}=\dfrac{13\left(3-18\right)}{40\left(15-2\right)}=\dfrac{-13\cdot15}{40\cdot13}=\dfrac{-15}{40}=-\dfrac{3}{8}\)