Jawabanmu

2013-12-06T19:21:02+07:00
  (-\frac{2}{5} +  \frac{11}{13}) .  \frac{5}{2}
samakan dulu penyebutnya
 = (\frac{26}{65} +  \frac{55}{65} ) .  \frac{5}{2}
=  \frac{81}{65} .  \frac{5}{2}
=  \frac{405}{130}  =  \frac{81}{26}

semoga membantu...