phan so

V

vansang02121998

- Ta có [tex]\frac{2.2}{2.3}.\frac{3.3}{3.4}.\frac{4.4}{4.5}.....\frac{99.99}{99.100}[/tex]
= [tex]\frac{2}{3}.\frac{3}{4}.\frac{4}{5}.....\frac{99}{100}[/tex]
= [tex]\frac{2.3.4.....99}{3.4.5.....100}[/tex]
= [tex]\frac{2}{100}[/tex]
=> [tex]\frac{x}{200}=\frac{2}{100}[/tex]
=> x=4
 
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