3 1/8 - 18 % - 3/4 =

3 1/8 - 18% - 3/4 =
= 25/8 - 18/100 - 3/4
= 25/8 - 9/50 - 3/4
= 625/200 - 36/200 - 150/200
= 439/200 = 2 39/200

Ke desimal :
3,125
0,18
____-
2,945
0,75
_____-
2,195

Semoga bermanfaat (≧∇≦)/(●´∀｀●)“ψ(｀∇´)ψ（＞ｙ＜）

3,875 - 0,6975 - 0,75 = 3,1775 - 0,75
                                  = 2,4275 = 2,423 (dibulatkan)