Question

(23 - 5 pe 18 ) + (8 pe 9 - 7 pe 12)

Answer 1

(23-5/18) + (8/9-7/12)= 23-5/18+8/9-7/12=23 - 5/18+16/18 -7/12=          
23+11/18 -7/12=23+22/36 - 21/36=23+1/36=828/36 +1/36=829/36

Answer 2

(23 - 5/18 ) + (8/9 - 7/12) =
=23 - 5/18 + 8/9 - 7/12 =
=(23*36 - 5*2 + 8*4 - 7*3)/36 =
=(828 -10 + 32 - 21)/36 =
=829/36=23,02(7)