0,75di kali 1/9+1/8_0,8di kali3/8=

0,75 x 1/9 + 1/8 - 0,8 x 3/8 
= 75/100 x 1/9 + 1/8 - 8/10 x 3/8
= 3/4 x 1/9 + 1/8 - 4/5 x 3/8
= 4/36 + 1/8 - 12/40
= 1/9 + 1/8 - 3/10
= 1/9 + 1/8 - 3/10
= 80/720 + 90/720 - 216/720
= 170/720 - 216/720
= - 46/720 atau 
= - 23/360