x-5.375=2又5/6x-5.375=2+5/6x-(5+375/1000)=2+5/6x-5-3/8=2+5/6x=2+5/6+5+3/8x=8又5/24
x-5.375=17/6=2+5/6x=5.375+2+5/6≈8.2