9.99-4.26+90.01-5.74 =9.99+90.01-(4.26+5.74) =100-10 =90
9.99-4.26+90.01-5.74 =9.99+90.01-（4.26+5.74） =100-10 =90
中国边防哨所45°21'55 0.37”N 90°34'22 ....8 .91“N 137°4'47 .63”E 5 @ UDM ^ 1...卢浮宫:48°51'39 .74”N,2°20'9 .26“。E...
9.99-4.26+90.01-5.74 =10-0.01+90+0.01-(4.26+5.74) =10+90-10 =90