Question

bài 2 :quy đồng rồi so sánh

a)                                b)

\(\frac{2525}{3535}va\frac{505050}{707070}\)\(\frac{2005}{2006}va\frac{200520052005}{200720072007}\)

 

Answer 1

a) 

2525/3535=5/7

505050/707070=5/7

vì 5/7 =5/7

=> 2525/3535=505050/707070

b)

200520052005/200720072007=2005/2007

vì 2005/2006>2005/2007

nên 2005/2006>200520052005/200720072007

Answer 2

a) Ta có: 2525/3535 = 5/7

505050/707070 = 5/7

Vì 5/7 = 5/7 nên 2525/3535 = 505050/707070

b) Ta có: 2005200520/200720072007 = 2005/2007

Vì 2006 < 2007 => 2005/2006 > 2005/2007

Nên 2005/2006 > 200520052005/200720072007