b) Ta có: \(1-\dfrac{530}{570}=\dfrac{40}{570}\)
\(1-\dfrac{531}{571}=\dfrac{40}{571}\)
mà \(\dfrac{40}{570}>\dfrac{40}{571}\)
nên \(1-\dfrac{530}{570}>1-\dfrac{531}{571}\)
\(\Leftrightarrow\dfrac{530}{570}< \dfrac{531}{571}\)
Tương tự như bài trên:
\(\dfrac{33}{131}=1-\dfrac{98}{131}< 1-\dfrac{98}{151}=\dfrac{53}{151}\)
a, vì 33<53
131<151
=>\(\dfrac{33}{131}< \dfrac{53}{151}\)
b, Vì 530<531
570<571
\(\Rightarrow\dfrac{530}{570}< \dfrac{531}{571}\)
a,Quy đồng ta có:
`33/131=4983/19781`
`53/151=6943/19781`
`=>53/151>33/131`
b,`530/570`
`=2101160090/(570.571)`
`531/571`
`=119700/(570.571)`
`=>530/570>531/571`