Tìm \[x\]:

b) \[\frac{1}{{1.2}} + \frac{1}{{2.3}} + \frac{1}{{3.4}} + ... + \frac{1}{{x\left( {x + 1} \right)}} = \frac{{2008}}{{2009}}\];

a) \[\frac{{x + 1}}{{99}} + \frac{{x + 2}}{{98}} + \frac{{x + 3}}{{97}} + \frac{{x + 4}}{{96}} = - 4\]

\[x\left( {\frac{1}{{99}} + \frac{1}{{98}} + \frac{1}{{97}} + \frac{1}{{96}}} \right) + \left( {\frac{1}{{99}} + \frac{2}{{98}} + \frac{3}{{97}} + \frac{4}{{96}}} \right) = - 4\]

\[x\left( {\frac{1}{{99}} + \frac{1}{{98}} + \frac{1}{{97}} + \frac{1}{{96}}} \right) = - \left( {1 + \frac{1}{{99}}} \right) - \left( {1 + \frac{2}{{98}}} \right) - \left( {1 + \frac{3}{{97}}} \right) - \left( {1 + \frac{4}{{96}}} \right)\]

\[x\left( {\frac{1}{{99}} + \frac{1}{{98}} + \frac{1}{{97}} + \frac{1}{{96}}} \right) = - \frac{{100}}{{99}} - \frac{{100}}{{98}} - \frac{{100}}{{97}} - \frac{{100}}{{96}}\]

\[x\left( {\frac{1}{{99}} + \frac{1}{{98}} + \frac{1}{{97}} + \frac{1}{{96}}} \right) =  - 100.\left( {\frac{1}{{99}} + \frac{1}{{98}} + \frac{1}{{97}} + \frac{1}{{96}}} \right)\]

\[x = - 100\].

Vậy \[x = - 100\].

c) \[\frac{{x - 214}}{{86}} + \frac{{x - 132}}{{84}} + \frac{{x - 54}}{{82}} = 6\]

\[x\left( {\frac{1}{{86}} + \frac{1}{{84}} + \frac{1}{{82}}} \right) = 6 + \frac{{214}}{{86}} + \frac{{132}}{{84}} + \frac{{54}}{{82}}\]

\[x\left( {\frac{1}{{86}} + \frac{1}{{84}} + \frac{1}{{82}}} \right) = \left( {1 + \frac{{214}}{{86}}} \right) + \left( {2 + \frac{{132}}{{84}}} \right) + \left( {3 + \frac{{54}}{{82}}} \right)\]

\[x\left( {\frac{1}{{86}} + \frac{1}{{84}} + \frac{1}{{82}}} \right) = \frac{{300}}{{86}} + \frac{{300}}{{84}} + \frac{{300}}{{82}}\]

\[x\left( {\frac{1}{{86}} + \frac{1}{{84}} + \frac{1}{{82}}} \right) = 300\left( {\frac{1}{{86}} + \frac{1}{{84}} + \frac{1}{{82}}} \right)\]

\[x = 300\]

Vậy \[x = 300\].