[tex] \ \ \cfrac{0.3 \cdot 7.8 : 0.39- \frac{5}{12} \cdot 3.6 }{1 \frac{5}{13} \cdot 0.26:0.1+0.4 } \\\\\\
=\cfrac{6- \frac{5}{12} \cdot \frac{18}{5} }{\frac{18}{13} \cdot 2.6+0.4 } \\\\\\
=\cfrac{6- \frac{3}{2} }{\frac{18}{13} \cdot \frac{13}{5} +0.4 } \\\\\\
=\cfrac{ \frac{12}{2} - \frac{3}{2} }{\frac{18}{5} +0.4 } \\\\\\
=\cfrac{ \frac{9}{2} }{3.6 +0.4 } \\ \\ \\ = \cfrac{ \frac{9}{2} }{4} \\\\\\ = \cfrac{9}{8} [/tex]
