Answer:
-5
Step-by-step explanation:
[tex]-2\frac{1}{2}\cdot \:6\frac{1}{2}\cdot \:12/39\\2\frac{1}{2}\\2\frac{1}{2}=\frac{2\cdot 2+1}{2}\\\frac{5}{2}\\-\frac{5}{2}\cdot \:6\frac{1}{2}\cdot \:12/39\\6\frac{1}{2}\\= 6\frac{1}{2}=\frac{6\cdot 2+1}{2}\\(\frac{13}{2}-\frac{5}{2})\cdot \frac{13}{2}\cdot \:12/39\\-\frac{5}{2}\cdot \frac{13}{2}\\\frac{5}{2}\cdot \frac{13}{2}=\frac{5\cdot \:13}{2\cdot \:2}\\-\frac{5\cdot \:13}{2\cdot \:2}\\-\frac{65}{2\cdot \:2}\\-\frac{65}{4}\\[/tex]
[tex]-\frac{65}{4}\cdot \:12\\=-\frac{65}{4}\cdot \frac{12}{1}\\\frac{65}{4}\cdot \frac{12}{1}=\frac{65\cdot \:12}{4\cdot \:1}\\\frac{65}{4}\cdot \frac{12}{1}=\frac{65\cdot \:12}{4\cdot \:1}\\-\frac{65\cdot \:12}{4}\\-65\cdot \:3\\= -195\\= -195/39\\-5[/tex]
