18÷2/3+0.65×8/13-2/7×18+5/13×0.65
=18×3/2+5.2/13-36/7+3.25/13
=27+5.2/13+3.25/13-36/7
=27+8.45/13-5-1/7
=22+(8.45×7-13)/91
=22+46.15/91
=22.5071