Question

-2 1/2 x 6 1/2 x 12/39=

Answer 1

-5

Explanation:

`-2(1)/(2)\cdot \:6(1)/(2)\cdot \:12/39\\2(1)/(2)\\2(1)/(2)=(2\cdot 2+1)/(2)\\(5)/(2)\\-(5)/(2)\cdot \:6(1)/(2)\cdot \:12/39\\6(1)/(2)\\= 6(1)/(2)=(6\cdot 2+1)/(2)\\((13)/(2)-(5)/(2))\cdot (13)/(2)\cdot \:12/39\\-(5)/(2)\cdot (13)/(2)\\(5)/(2)\cdot (13)/(2)=(5\cdot \:13)/(2\cdot \:2)\\-(5\cdot \:13)/(2\cdot \:2)\\-(65)/(2\cdot \:2)\\-(65)/(4)\\`

`-(65)/(4)\cdot \:12\\=-(65)/(4)\cdot (12)/(1)\\(65)/(4)\cdot (12)/(1)=(65\cdot \:12)/(4\cdot \:1)\\(65)/(4)\cdot (12)/(1)=(65\cdot \:12)/(4\cdot \:1)\\-(65\cdot \:12)/(4)\\-65\cdot \:3\\= -195\\= -195/39\\-5`