1-0.2-0.02-0.002-0.0002
0.9+0.99+0.999+0.9999
20.96-11.38-7.62
18.2-0.98+3.27
87.4-(63.7-29.56)
175-15-45◯175-45-15
186-(86+67)◯186-86-67
589-326-74◯589-(326+74)
316-95-116◯316-116-95
我发现:( )。(用字母表示)
27.3+73.2+72.7 43.25- 10.4-3.25
5.85-(1.89+1.85) 14.37-(7.42-4.37)
64.3-18.75+15.7-11.25
3.49+12.4+6.66 4.6+3.3-4.4+6.7 37.12-19.78-2.22
24.75-4.96-6.75 12.64-(2.75+7.64) 12.8-(2.8+4.67)-5.33
1000-1-2-3-4-5-6-7-8-9-91-92-93-94一95-96-97-98-99