Question

So sánh các số hữu tỉ sau

a) \(\frac{2}{-7};\frac{-3}{11}\)

b) \(\frac{-213}{300};\frac{18}{-25}\)

c)\(-0,75;\frac{3}{4}\)

d) \(\frac{2014}{2015};\frac{2015}{2016}\)

 

 

Answer 1

a,\(\frac{2}{-7}< \frac{-3}{11}\)

b,\(\frac{-213}{300}>\frac{18}{-25}\)

c,\(-0,75=\frac{-3}{4}< \frac{3}{4}\)

d,\(\frac{2014}{2015}< \frac{2015}{2016}\)

Answer 2

a,\(\frac{2}{-7}=\frac{-2}{7}=\frac{-22}{77}< \frac{-3}{11}=\frac{-21}{77}\)

b,\(\frac{-213}{300}=\frac{-71}{100}>\frac{18}{-25}=\frac{-18}{25}=\frac{-72}{100}\)

c,giống ở dưới

d,Ta có\(1-\frac{2014}{2015}=\frac{1}{2015}\)

\(1-\frac{2015}{2016}=\frac{1}{2016}\)

Vì \(\frac{1}{2015}>\frac{1}{2016}\)nên \(\frac{2014}{2015}< \frac{2015}{2016}\)