27.38-5.34+2.62-4.66=(27.38+2.62)-(5.34+4.66)=30-10=20 0.07 0.12 0.36+0.45----- 1.00
27.38-5.34+2.62-4.66=27.38+2.62-5.34-4.66=30-10=20 0.07+0.12+0.36+0.45=1