(1)10.1×79 =(10+0.1)×79 =10×79+0.1×79 =790+7.9 =797.9 (2)3375÷(921-73×12) =3375÷(921-876) =3375÷45 =75 (3)10÷3.14-6.86÷3.14 =(10-6.86)÷3.14 =3.14÷3.14 =1 (4)[2分之1-(4分之3-7分之3)]÷7分之5 =[2分之1-28。