脱式计算3.75-6.8*0.26 （9-2.35）*0.64 用简便78.7-17.7*3.6 9.9*（101-9.

3.75-6.8*0.26 =3.75-1.768 =1.982 (9-2.35)*0.64 =6.65*0.64 =4.256 78.7-17.7*3.6 =78.7-63.72 =14.98 9.9*(101-9.9) =9.9*91.1 =901.89