Question

14 ) (27 . 45 + 27 . 55 ) : (2 + 4 + 6 + 8 ........+18)

15 ) (26 . 108 - 26.12) : ( 32 - 18 + 24 -20 +16 - 12 + 8 -4)

Answer 1

14)

\(\left(27.45+27.55\right):\left(2+4+6+...+18\right)\)

\(=\left[27\left(45+55\right)\right]:\left[\frac{\left(18+2\right)9}{2}\right]\)

\(=\left(27.100\right):90\)

\(=2700:90\)

\(=30\)

15)

\(\left(26.180-26.12\right):\left(32-18+....+8-4\right)\) 

\(=26\left(180-12\right):\left(14+4+4+4+4+4+4+4\right)\)

\(=26.168:42\)

\(=84\)